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The London Underground, Underground or Tube is a rapid transit system serving a large part of Greater Londonmarker and neighbouring areas of Essex, Hertfordshiremarker and Buckinghamshire in the UKmarker. The first section opened in 1863, and was the first underground railway system in the world, and, starting in 1890, it was also the first to operate electric trains. It is usually referred to as the Underground or the Tube—the latter deriving from the shape of the system's deep-bore tunnel—although about 55% of the network is above ground.

The earlier lines of the present London Underground network were built by various private companies. Apart from the main line railways, they became part of an integrated transport system in 1933 when the London Passenger Transport Board (LPTB) or London Transport was created. The underground network became a single entity in 1985, when the UK government created London Underground Limited (LUL). Since 2003 LUL has been a wholly owned subsidiary of Transport for London (TfL), the statutory corporation responsible for most aspects of the transport system in Greater Londonmarker, which is run by a board and a commissioner appointed by the Mayor of London.

The Underground has 270 stations and about 400 km (250 miles) of track, making it the longest metro system in the world by route length. It also has one of the highest number of stations. In 2007, more than one billion passenger journeys were recorded, making it the third busiest metro system in Europe after Paris and Moscow.

The tube map, with its schematic non-geographical layout and colour-coded lines, is considered a design classic, and many other transport maps worldwide have been influenced by it.

History

Railway construction in the United Kingdommarker began in the early 19th century. By 1854 six separate railway terminals had been built just outside the centre of London: London Bridgemarker, Eustonmarker, Paddingtonmarker, King's Crossmarker, Bishopsgatemarker and Waterloomarker. At this point, only Fenchurch Street Stationmarker was located in the actual City of Londonmarker. Traffic congestion in the city and the surrounding areas had increased significantly in this period, partly due to the need for rail travellers to complete their journeys into the city centre by road. The idea of building an underground railway to link the City of London with the mainline terminals had first been proposed in the 1830s, but it was not until the 1850s that the idea was taken seriously as a solution to traffic congestion.

The first underground railways

Construction of the Metropolitan Railway near King's Cross station, 1861
In 1854 an Act of Parliament was passed approving the construction of an underground railway between Paddington Stationmarker and Farringdon Streetmarker via King's Crossmarker which was to be called the Metropolitan Railway. The Great Western Railway (GWR) gave financial backing to the project when it was agreed that a junction would be built linking the underground railway with their mainline terminus at Paddington. GWR also agreed to design special trains for the new subterranean railway.

A shortage of funds delayed construction for several years. The fact that this project got under way at all was largely due to the lobbying of Charles Pearson, who was Solicitor to the City of London Corporation at the time. Pearson had supported the idea of an underground railway in London for several years. He advocated plans for the demolition of the unhygienic slums which would be replaced by new accommodation for their inhabitants in the suburbs, with the new railway providing transportation to their places of work in the city centre. Although he was never directly involved in the running of the Metropolitan Railway, he is widely credited as being one of the first true visionaries behind the concept of underground railways. And in 1859 it was Pearson who persuaded the City of London Corporation to help fund the scheme. Work finally began in February 1860, under the guidance of chief engineer John Fowler. Pearson died before the work was completed.

The Metropolitan Railway opened on 10 January 1863. Within a few months of opening it was carrying over 26,000 passengers a day. The Hammersmith and City Railway was opened on 13 June 1864 between Hammersmithmarker and Paddington. Services were initially operated by GWR between Hammersmith and Farringdon Street. By April 1865 the Metropolitan had taken over the service. On 23 December 1865 the Metropolitan's eastern extension to Moorgate Streetmarker opened. Later in the decade other branches were opened to Swiss Cottagemarker, South Kensingtonmarker and Addison Road, Kensington (now known as Kensington Olympiamarker). The railway had initially been dual gauge, allowing for the use of GWR's signature broad gauge rolling stock and the more widely used standard gauge stock. Disagreements with GWR had forced the Metropolitan to switch to standard gauge in 1863 after GWR withdrew all its stock from the railway. These differences were later patched up, however broad gauge was totally withdrawn from the railway in March 1869.

On 24 December 1868, the Metropolitan District Railway began operating services between South Kensington and Westminstermarker using Metropolitan Railway trains and carriages. The company, which soon became known as "the District", was first incorporated in 1864 to complete an Inner Circle railway around Londonmarker in conjunction with the Metropolitan. This was part of a plan to build both an Inner Circle line and Outer Circle line around London.

A fierce rivalry soon developed between the District and the Metropolitan. This severely delayed the completion of the Inner Circle project as the two companies competed to build far more financially lucrative railways in the suburbs of London. The London and North Western Railway (LNWR) began running their Outer Circle service from Broad Streetmarker via Willesden Junctionmarker, Addison Road and Earl's Courtmarker to Mansion Housemarker in 1872. The Inner Circle was not completed until 1884, with the Metropolitan and the District jointly running services. In the meantime, the District had finished its route between West Bromptonmarker and Blackfriarsmarker in 1870, with an interchange with the Metropolitan at South Kensington. In 1877, it began running its own services from Hammersmithmarker to Richmondmarker, on a line originally opened by the London & South Western Railway (LSWR) in 1869. The District then opened a new line from Turnham Greenmarker to Ealingmarker in 1879 and extended its West Brompton branch to Fulhammarker in 1880. Over the same decade the Metropolitan was extended to Harrow-on-the-Hill stationmarker in the north-west.

The early tunnels were dug mainly using cut-and-cover construction methods. This caused widespread disruption and required the demolition of several properties on the surface. The first trains were steam-hauled, which required effective ventilation to the surface. Ventilation shafts at various points on the route allowed the engines to expel steam and bring fresh air into the tunnels. One such vent is at Leinster Gardens, W2. In order to preserve the visual characteristics in what is still a well-to-do street, a five-foot-thick (1.5 m) concrete façade was constructed to resemble a genuine house frontage.

On 7 December 1869 the London, Brighton and South Coast Railway (LB&SCR) started operating a service between Wappingmarker and New Cross Gatemarker on the East London Railway (ELR) using the Thames Tunnelmarker designed by Marc Brunel, who designed the revolutionary tunnelling shield method which made its construction not only possible, but safer, and completed by his son Isambard Kingdom Brunel. This had opened in 1843 as a pedestrian tunnel, but in 1865 it was purchased by the ELR (a consortium of six railway companies: the Great Eastern Railway (GER); London, Brighton and South Coast Railway (LB&SCR); London, Chatham and Dover Railway (LCDR); South Eastern Railway (SER); Metropolitan Railway; and the Metropolitan District Railway) and converted into a railway tunnel. In 1884 the District and the Metropolitan began to operate services on the line.

By the end of the 1880s, underground railways reached Cheshammarker on the Metropolitan, Hounslowmarker, Wimbledonmarker and Whitechapelmarker on the District and New Crossmarker on the East London Railway. By the end of the 19th century, the Metropolitan had extended its lines far outside of London to Aylesburymarker, and Brillmarker, creating new suburbs along the route—later publicised by the company as Metro-land. Right up until the 1930s the company maintained ambitions to be considered as a main line rather than an urban railway.

First tube lines

Following advances in the use of tunnelling shields, electric traction and deep-level tunnel designs, later railways were built even further underground. This caused much less disruption at ground level and it was therefore cheaper and preferable to the cut-and-cover construction method.

The City & South London Railway (C&SLR, now part of the Northern Line) opened in 1890, between Stockwellmarker and the now closed original terminus at King William Streetmarker. It was the first "deep-level" electrically operated railway in the world. By 1900 it had been extended at both ends, to Clapham Commonmarker in the south and Moorgate Street (via a diversion) in the north. The second such railway, the Waterloo and City Railway (W&CR), opened in 1898. It was built and run by the London and South Western Railway.

On 30 July 1900, the Central London Railway (now known as the Central line) was opened, operating services from Bank to Shepherd's Bush. It was nicknamed the "Twopenny Tube" for its flat fare and cylindrical tunnels; the "tube" nickname was eventually transferred to the Underground system as a whole. An interchange with the C&SLR and the W&CR was provided at Bank. Construction had also begun in August 1898 on the Baker Street & Waterloo Railway, however work came to a halt after 18 months when funds ran out.

Integration

In the early 20th century the presence of six independent operators running different Underground lines caused passengers substantial inconvenience; in many places passengers had to walk some distance above ground to change between lines. The costs associated with running such a system were also heavy, and as a result many companies looked to financiers who could give them the money they needed to expand into the lucrative suburbs as well as electrify the earlier steam operated lines. The most prominent of these was Charles Yerkes, an American tycoon who secured the right to build the Charing Cross, Euston and Hampstead Railway (CCE&HR) on 1 October 1900. In March 1901, he effectively took control of the District and this enabled him to form the Metropolitan District Electric Traction Company (MDET) on 15 July. Through this he acquired the Great Northern & Strand Railway and the Brompton & Piccadilly Circus Railway in September 1901, the construction of which had already been authorised by Parliament, together with the moribund Baker Street & Waterloo Railway in March 1902. On 9 April the MDET evolved into the Underground Electric Railways of London Company Ltd (UERL). The UERL also owned three tramway companies and went on to buy the London General Omnibus Company, creating an organisation colloquially known as "the Combine" which went on to dominate underground railway construction in London until the 1930s.
The Circle and District Line platforms at Embankment station


With the financial backing of Yerkes, the District opened its South Harrowmarker branch in 1903 and completed its link to the Metropolitan's Uxbridgemarker branch at Rayners Lanemarker in 1904—although services to Uxbridge on the District did not begin until 1910 due to yet another disagreement with the Metropolitan. By the end of 1905, all District Railway and Inner Circle services were run by electric trains.

The Baker Street & Waterloo Railway opened in 1906, soon branding itself the Bakerloo, and by 1907 it had been extended to Edgware Roadmarker in the north and Elephant & Castlemarker in the south. The newly named Great Northern, Piccadilly and Brompton Railway, combining the two projects acquired by MDET in September 1901, also opened in 1906. With tunnels at an impressive depth of 200 feet below the surface, it ran from Finsbury Park to Hammersmith; a single station branch to Strandmarker (later renamed Aldwych) was added in 1907. In the same year the CCE&HR opened from Charing Crossmarker to Camden Townmarker, with two northward branches, one to Golders Greenmarker and one to Highgatemarker (now Archwaymarker).

Independent ventures did continue in the early part of the 20th century. The independent Great Northern & City Railway opened in 1904 between Finsbury Parkmarker and Moorgatemarker. It was the only tube line of sufficient diameter to be capable of handling main line stock, and it was originally intended to be part of a main line railway. However money soon ran out and the route remained separate from the main line network until the 1970s. The C&SLR was also extended northwards to Eustonmarker by 1907.

In early 1908, in an effort to increase passenger numbers, the underground railway operators agreed to promote their services jointly as "the Underground", publishing new adverts and creating a free publicity map of the network for the purpose. The map featured a key labelling the Bakerloo Railway, the Central London Railway, the City & South London Railway, the District Railway, the Great Northern & City Railway, the Hampstead Railway (the shortened name of the CCE&HR), the Metropolitan Railway and the Piccadilly Railway. Some other railways appeared on the map but with less prominence than the aforementioned lines. These included part of the ELR (although the map wasn't big enough to fit in the whole line) and the Waterloo and City Railway. As the latter was owned by a main line railway company it wasn't included in this early phase of integration. As part of the process, "The Underground" name appeared on stations for the first time and electric ticket-issuing machines were also introduced. This was followed in 1913 by the first appearance of the famous circle and horizontal bar symbol, known as "the roundel", designed by Edward Johnston.

On 1 January 1913 the UERL absorbed two other independent tube lines, the C&SLR and the Central London Railway. As the Combine expanded, only the Metropolitan stayed away from this process of integration, retaining its ambition to be considered as a main line railway. Proposals were put forward for a merger between the two companies in 1913 but the plan was rejected by the Metropolitan. In the same year the company asserted its independence by buying out the cash strapped Great Northern and City Railway. It also sought a character of its own. The Metropolitan Surplus Lands Committee had been formed in 1887 to develop accommodation alongside the railway and in 1919 Metropolitan Railway Country Estates Ltd. was founded to capitalise on the post-World War One demand for housing. This ensured that the Metropolitan would retain an independent image until the creation of London Transport in 1933.

The Metropolitan also sought to electrify its lines. The District and the Metropolitan had agreed to use the low voltage DC system for the Inner Circle, comprising two electric rails to power the trains, back in 1901. At the start of 1905 electric trains began to work the Uxbridge branch and from 1 November 1906 electric locomotives took trains as far as Wembley Parkmarker where steam trains took over. This changeover point was moved to Harrow on 19 July 1908. The Hammersmith & City branch had also been upgraded to electric working on 5 November 1906. The electrification of the ELR followed on 31 March 1913, the same year as the opening of its extension to Whitechapelmarker and Shoreditchmarker. Following the Grouping Act of 1921, which merged all the cash strapped main line railways into four companies (thus obliterating the original consortium that had built the ELR), the Metropolitan agreed to run passenger services on the line.

The Bakerloo line extension to Queen's Parkmarker was completed in 1915, and the service extended to Watford Junctionmarker via the London and North Western Railway tracks in 1917. The extension of the Central line to Ealing Broadwaymarker was delayed by the war until 1920.

The major development of the 1920s was the integration of the CCE&HR and the C&SLR and extensions to form what was to become the Northern line. This necessitated enlargement of the older parts of the C&SLR, which had been built on a modest scale. The integration required temporary closures during 1922—24. The Golders Greenmarker branch was extended to Edgwaremarker in 1924, and the southern end was extended to Mordenmarker in 1926.

The Watfordmarker branch of the Metropolitan opened in 1925 and in the same year electrification was extended to Rickmansworth. The last major work completed by the Metropolitan was the branch to Stanmoremarker which opened in 1932.

By 1933 the Combine had completed the Cockfostersmarker branch of the Piccadilly Line, with through services running (via realigned tracks between Hammersmith and Acton Townmarker) to Hounslow Westmarker and Uxbridgemarker.

London Transport

In 1933 the Combine, the Metropolitan and all the municipal and independent bus and tram undertakings were merged into the London Passenger Transport Board (LPTB), a self-supporting and unsubsidised public corporation which came into being on 1 July 1933. The LPTB soon became known as London Transport (LT).

Shortly after it was created, LT began the process of integrating the underground railways of London into one network. All the separate railways were given new names in order to become lines within it. A free map of these lines, designed by Harry Beck, was issued in 1933. It featured the District Line, the Bakerloo Line, the Piccadilly Line, the Edgware, Highgate and Morden Line, the Metropolitan Line, the Great Northern & City Line, the East London Line and the Central London Line. Commonly regarded as a design classic, an updated version of this map is still in use today. The Waterloo & City line was not included in this map as it was still owned by a main line railway (the Southern Railway since 1923) and not LT.

LT announced a scheme for the expansion and modernisation of the network entitled the New Works Programme, which had followed the announcement of improvement proposals for the Metropolitan Line. This consisted of plans to extend some lines, to take over the operation of others from main-line railway companies, and to electrify the entire network. During the 1930s and 1940s, several sections of main-line railways were converted into surface lines of the Underground system. The oldest part of today's Underground network is the Central line between Leytonmarker and Loughtonmarker, which opened as a railway seven years before the Underground itself.

LT also sought to abandon routes which made a significant financial loss. Soon after the LPTB started operating, services to Verney Junction and Brill on the Metropolitan Railway were stopped. The renamed "Metropolitan Line" terminus was moved to Aylesburymarker.

The outbreak of World War II delayed all the expansion schemes. From mid-1940, the Blitz led to the use of many Underground stations as shelters during air raids and overnight. The authorities initially tried to discourage and prevent this, but later supplied bunk, latrines, and catering facilities. Later in the war, eight London deep-level shelters were constructed under stations, ostensibly to be used as shelters (each deep-level shelter could hold 8,000 people) though plans were in place to convert them for a new express line parallel to the Northern line after the war. Some stations (now mostly disused) were converted into government offices: for example, Down Streetmarker was used for the headquarters of the Railway Executive Committee and was also used for meetings of the War Cabinet before the Cabinet War Roomsmarker were completed;
 Brompton Roadmarker was used as a control room for anti-aircraft gun and the remains of the surface building are still used by London's University Royal Naval Unit (URNU) and University London Air Squadron (ULAS).


After the war one of the last acts of the LPTB was to give the go-ahead for the completion of the postponed Central Line extensions. The western extension to West Ruislipmarker was completed in 1948, and the eastern extension to Eppingmarker in 1949; the single-line branch from Epping to Ongar was taken over and electrified in 1957.

Nationalisation

On 1 January 1948 London Transport was nationalised by the incumbent Labour government, together with the four remaining main line railway companies, and incorporated into the operations of the British Transport Commission (BTC). The LPTB was replaced by the London Transport Executive (LTE). This brought the Underground under the remit of central government for the first time in its history.

The implementation of nationalised railways was a move of necessity as well as ideology. The main line railways had struggled to cope with a war economy in the First World War and by the end of World War Two the four remaining companies were on the verge of bankruptcy. Nationalisation was the easiest way to save the railways in the short term and provide money to fix war time damage. The BTC necessarily prioritised the reconstruction of its main line railways over the maintenance of the Underground network. The unfinished parts of the New Works Programme were gradually shelved or postponed.

However the BTC did authorise the completion of the electrification of the network, seeking to replace steam locomotives on the parts of the system where they still operated. This phase of the programme was completed when the Metropolitan Line was electrified to Cheshammarker in 1960. Steam locomotives were fully withdrawn from London Underground passenger services on 9 September 1961, when British Railways took over the operations of the Metropolitan line between Amershammarker and Aylesbury. The last steam shunting and freight locomotive was withdrawn from service in 1971.

In 1963 the LTE was replaced by the London Transport Board, directly accountable to the Ministry of Transportmarker.

GLC Control

On 1 January 1970, the Greater London Council (GLC) took over responsibility for London Transport, again under the formal title London Transport Executive. This period is perhaps the most controversial in London's transport history, characterised by staff shortages and a severe lack of funding from central government. In 1980 the Labour-led GLC began the 'Fares Fair' project, which increased local taxation in order to lower ticket prices. The campaign was initially successful and usage of the Tube significantly increased. But serious objections to the policy came from the London Borough of Bromleymarker, an area of London which has no Underground stations. The Council resented the subsidy as it would be of little benefit to its residents. The council took the GLC to the Law Lords who ruled that the policy was illegal based on their interpretation of the Transport (London) Act 1969. They ruled that the Act stipulated that London Transport must plan, as far as was possible, to break even. In line with this judgement, 'Fares Fair' was therefore reversed, leading to a 100% increase in fares in 1982 and a subsequent decline in passenger numbers. The scandal prompted Margaret Thatcher's Conservative Government to remove the London Transport from the GLC's control in 1984, a development that turned out to be a prelude to the abolition of the GLC in 1986.

However the period saw the first real post-war investment in the network with the opening of the carefully planned Victoria Line, which was built on a diagonal northeast-southwest alignment beneath Central London, incorporating centralised signalling control and automatically driven trains. It opened in stages between 1968 and 1971. The Piccadilly line was extended to Heathrow Airportmarker in 1977, and the Jubilee line was opened in 1979, taking over part of the Bakerloo line, with new tunnels between Baker Streetmarker and Charing Crossmarker. There was also one important legacy from the 'Fares Fair' scheme, the introduction of ticket zones, which remain in use today.

London Regional Transport

In 1984 Margaret Thatcher's Conservative Government removed London Transport from the GLC's control, replacing it with London Regional Transport (LRT) on 19 June 1984 - a statutory corporation for which the Secretary of State for Transport was directly responsible. The Government planned to modernise the system while slashing its subsidy from taxpayers and ratepayers. As part of this strategy London Underground Limited was set up on 1 April 1985 as a wholly owned subsidiary of LRT to run the network.

The prognosis for LRT was good. Oliver Green, the then Curator of the London Transport Museummarker, wrote in 1987:

However cost-cutting was not without its critics. At 19:30 on 18 November 1987 a firemarker swept through King's Cross St Pancras Undeground station, the busiest station on the network, killing 31 people. It later turned out that the fire had started in an escalator shaft serving the Piccadilly Line, which was burnt out along with the top level (entrances and ticket hall) of the deep-level tube station. The escalator on which the fire started had been built just before World War II. The steps and sides of the escalator were partly made of wood, meaning that they burned quickly and easily. Although smoking was banned on the subsurface sections of the London Underground in February 1985 (a consequence of the Oxford Circus firemarker), the fire was most probably caused by a commuter discarding a burning match, which fell down the side of the escalator onto the running track (Fennell 1988, p. 111). The running track had not been cleaned in some time and was covered in grease and fibrous detritus. The Member of Parliament for the area, Frank Dobson, informed the House of Commonsmarker that the number of transportation employees at the station, which handled 200,000 passengers every day at the time, had been cut from 16 to ten, and the cleaning staff from 14 to two. The tragic event led to the abolition of wooden escalators at all Underground stations and pledges of greater investment.

In 1994, with the privatisation of British Rail, LRT took control of the Waterloo and City line, incorporating it into the Underground network for the first time. This year also saw the end of services on the little used Epping-Ongarmarker branch of the Central Line and the Aldwych branch of the Piccadilly Line after it was agreed that necessary maintenance and upgrade work would not be cost effective.

In 1999 the Jubilee line extension to Stratfordmarker in London's East End was completed. This plan included the opening of a completely refurbished interchange station at Westminstermarker. The Jubilee line's old terminal platforms at Charing Cross were closed but maintained operable for emergencies.

Public Private Partnership

Transport for London (TfL) replaced LRT in 2000, a development that coincided with the creation of a directly-elected Mayor of London and the London Assembly.

In January 2003 the Underground began operating as a Public-Private Partnership (PPP), whereby the infrastructure and rolling stock were maintained by two private companies (Metronet and Tube Lines) under 30-year contracts, while London Underground Limited remained publicly owned and operated by TfL.

PPP was controversial from the start. Supporters of the change claimed that the private sector would eliminate the inefficiencies of public sector enterprises and take on the risks associated with running the network, while opponents said that the need to make profits would reduce the investment and public service aspects of the Underground. The scheme was put in jeopardy when Metronet, which was responsible for two-thirds of the network, went into administration on 18 July 2007 after costs for its projects spiralled out of control. The case for PPP was further weakened a year later when it emerged that Metronet's demise had cost the UK government £2 billion. The five private companies that made up the Metronet alliance had to pay £70m each towards paying off the debts acquired by the consortium. But under a deal struck with the Government in 2003 the companies were protected from any further liability. The UK taxpayer therefore had to foot the rest of the bill. This undermined the argument that the PPP would place the risks involved in running the network into the hands of the private sector.

TfL took over the responsibilities of Metronet following its collapse. The Government made concerted efforts to find another private firm to fill the void but none came forward. TfL and the Department for Transportmarker have since agreed to allow TfL to continue operating the areas that were formerly the responsibility of Metronet. An independent panel will review TfL's investment programme. This leaves two-thirds of the Underground network completely under the control of TfL. The Secretary of State for Transport, Lord Adonis, has hinted that a separate arrangement may be made for the Bakerloo line at a later date.

Maintenance on the Jubilee, Northern and Piccadilly lines remains the responsibility of Tube Lines, although this too has not been without controversy. The relationship between London Underground and Tube Lines has deteriorated with disagreements over priorities, estimates and whether Tubes Lines has sufficient funds to meet its commitments. Both sides appear to be openly criticising the other and the situation shows no signs of improving. However Tube Lines appears to be more stable than Metronet was prior to its demise.

Transport for London

Transport for London (TfL) was created in 2000 as the integrated body responsible for London's transport system. It replaced London Regional Transport. It assumed control of London Underground Limited in July 2003.

TfL is part of the Greater London Authority and is constituted as a statutory corporation regulated under local government finance rules. It has three subsidiaries: London Transport Insurance (Guernsey) Ltd., the TfL Pension Fund Trustee Co. Ltd. and Transport Trading Ltd (TTL). TTL has six wholly-owned subsidiaries, one of which is London Underground Limited.

The TfL Board is appointed by the Mayor of London. The Mayor also sets the structure and level of public transport fares in London. However the day-to-day running of the corporation is left to the Commissioner of Transport for London. The current Commissioner is Peter Hendy.

The Mayor is responsible for producing an integrated transport strategy for London and for consulting the GLA, TfL, local councils and others on the strategy. The Mayor is also responsible for setting TfL's budget. The GLA is consulted on the Mayor's transport strategy, and inspects and approves the Mayor's budget. It is able to summon the Mayor and senior staff to account for TfL's performance. London TravelWatch, a body appointed by and reporting to the Assembly, deals with complaints about transport in London.

Infrastructure

Stations and lines

The London Underground's 11 lines are the Bakerloo line, Central line, Circle line, District line, Hammersmith & City line, Jubilee line, Metropolitan line, Northern line, Piccadilly line, Victoria line, and Waterloo & City line.

Until 2007 there was a twelfth line, the East London line, but this has closed for rebuilding work. It will be reopen as part of London Overground - part of the National Rail network and eventually connected to its North London Line - in 2010.

London Underground lines
Name Map colour First

operated
First section

opened*
Name dates

from
Type Length

(km)
Length

(miles)
Stations Current Stock Future Stock Journeys

per annum (x 1,000)
Average journeys

per mile (x 1,000)
Bakerloo line Brown 1906 1906 1906 Deep level 23.2 14.5 25 1972 Stock 104,000 7,172
Central line Red 1900 1856 1900 Deep level 74 46 49 1992 Stock n/a 199,000 4,326
Circle line Yellow 1884 1863 1949 Subsurface 22.5 14 26 C Stock S Stock from 2010 74,000 5,286
District line Green 1868 1868 1868–1905 Subsurface 64 40 55 C Stock and D78 Stock n/a 188,000 4,700
Hammersmith & City line Pink 1863 1858 1988 Subsurface 26.5 16.5 26 C Stock S Stock from 2010 50,000 3,030
Jubilee line Silver 1979 1879 1979 Deep level 36.2 22.5 25 1996 Stock n/a 127,584 5,670
Metropolitan line Dark Magenta 1863 1863 1863 Subsurface 66.7 41.5 35 S Stock 58,000 1,398
Northern line Black 1890 1867 1937 Deep level 58 36 48 1995 Stock 206,987 5,743
Piccadilly line Dark Blue 1906 1869 1906 Deep level 71 44.3 52 1973 Stock 2014 Stock from 2014/2015 176,177 3,977
Victoria line Light Blue 1968 1968 1968 Deep level 21 13.25 16 1967 Stock 2009 Stock currently being rolled out. 174,000 13,132
Waterloo & City line Turquoise 1898 1898 1898 Deep level 2.5 1.5 2 1992 Stock n/a 9,616 6,410
* Where a year is shown that is earlier than that shown for First operated, this indicates that the line operates over a route first operated by another Underground line or by another railway company.

† Prior to 1994, the Waterloo & City line was operated by British Rail and its predecessors.


The Underground serves 268 stations by rail; an additional six stations that were on the East London line are served by Underground replacement buses. Fourteen Underground stations are outside Greater London, of which five (Amershammarker, Chalfont & Latimermarker, Cheshammarker, Chorleywoodmarker, Eppingmarker) are beyond the M25 London Orbital motorwaymarker. Of the 32 London boroughs, six (Bexleymarker, Bromleymarker, Croydonmarker, Kingstonmarker, Lewishammarker and Suttonmarker) are not served by the Underground network, while Hackneymarker only has Old Streetmarker and Manor Housemarker on its boundaries.



Lines on the Underground can be classified into two types: subsurface and deep-level. The subsurface lines were dug by the cut-and-cover method, with the tracks running about below the surface. The deep-level or tube lines, bored using a tunnelling shield, run about below the surface (although this varies considerably), with each track in a separate tunnel. These tunnels can have a diameter as small as and the loading gauge is thus considerably smaller than on the subsurface lines. Lines of both types usually emerge onto the surface outside the central area.

While the tube lines are for the most part self-contained, the subsurface lines are part of an interconnected network: each shares track with at least two other lines. The subsurface arrangement is similar to the New York City Subway, which also runs separate "lines" over shared tracks.

Rolling stock and electrification

The Underground uses rolling stock built between 1960 and 2005. Stock on subsurface lines is identified by a letter (such as A Stock, used on the Metropolitan line), while tube stock is identified by the year in which it was designed (for example, 1996 Stock, used on the Jubilee line). All lines are worked by a single type of stock except the District line, which uses both C and D Stock. Two types of stock are currently being developed — 2009 Stock for the Victoria line and S stock for the subsurface lines, with the Metropolitan line A Stock being replaced first. Rollout of both is expected to begin about 2009. In addition to the Electric Multiple Units described above, there is engineering stock, such as ballast trains and brake vans, identified by a 1-3 letter prefix then a number.

The Underground is one of the few networks in the world that uses a four-rail system. The additional rail carries the electrical return that on third-rail and overhead networks is provided by the running rails. On the Underground a top-contact third rail is beside the track, energised at +420 V DC, and a top-contact fourth rail is centrally between the running rails, at -210 V DC, which combine to provide a traction voltage of 630 V DC.

In cases where the lines are shared with mainline trains which use a three-rail system, the third rail is set at +630 V, and the fourth rail at 0 V DC.

Cooling

In summer, temperatures on parts of the London Underground can become very uncomfortable due to its deep and poorly ventilated tube tunnels: temperatures as high as were reported in the 2006 European heat wave. Posters may be observed on the Underground network advising that passengers carry a bottle of water to help keep cool.2009 stock and new S-stock trains will have air conditioning.

Planned improvements and expansions

There are many planned improvements to the London Underground. A new station opened on the Piccadilly line at Heathrow Airport Terminal 5marker on 27 March 2008 and is the first extension of the London Underground since 1999. Each line is being upgraded to improve capacity and reliability, with new computerised signalling, automatic train operation (ATO), track replacement and station refurbishment, and, where needed, new rolling stock. A trial programme for a groundwater cooling system in Victoria stationmarker took place in 2006 and 2007; it aimed to determine whether such a system would be feasible and effective if in widespread use. A trial of mobile phone coverage on the Waterloo & City line aims to determine whether coverage can be extended across the rest of the Underground network.

Although not part of London Underground, the Crossrail scheme will provide a new route across central London integrated with the tube network.

The long proposed Chelsea-Hackney line, which is planned to begin operation in 2025, may be part of the London Underground, which would mean it would give the network a new Northeast to South cross London line to provide more interchanges with other lines and relieve overcrowding on other lines. However it is still on the drawing board. It was first proposed in 1901 and has been in planning since then. In 2007 the line was passed over to Cross London Rail Ltd, the current developers of Crossrail. Therefore, the line may be either part of the London Underground network or the National Rail network. There are advantages and disadvantages for both.

The Croxley Rail Linkmarker proposal envisages diverting the Metropolitan line Watford branch to Watford Junction stationmarker along a disused railway track. The project awaits funding from Hertfordshire County Council and the Department for Transportmarker, and remains at the proposal stage.

London Mayor Boris Johnson suggested he may be thinking of extending the Bakerloo line to Lewishammarker, Catfordmarker and Hayesmarker as South London lacks Underground lines but has a major Suburban rail network instead.

Travelling

Ticketing

London Authorities' Freedom Pass (disabled version)
The Underground uses TfL's Travelcard zones to calculate fares. Greater London is divided into 6 zones; Zone 1 is the most central, with a boundary just beyond the Circle line, and Zone 6 is the outermost and includes London Heathrow Airportmarker. Stations on the Metropolitan line outside Greater London are in Zones 7-9.

Travelcard zones 7–9 also apply on the Euston-Watford Junction line (part of the London Overground) as far as Watford High Street. Watford Junction is outside these zones and special fares apply.

There are staffed ticket offices, some open for limited periods only, and ticket machines usable at any time. Some machines that sell a limited range of tickets accept coins only, other touch-screen machines accept coins and banknotes, and usually give change. These machines also accept major credit and debit cards: some newer machines accept cards only.

More recently, TfL has introduced the Oyster card, a smartcard with an embedded contactless RFID chip, that travellers can obtain, charge with credit, and use to pay for travel. Like Travelcards they can be used on the Underground, buses, trams and the Docklands Light Railway. The Oyster card is cheaper to operate than cash ticketing or the older-style magnetic-strip-based Travelcards , and the Underground is encouraging passengers to use Oyster cards instead of Travelcards and cash (on buses) by implementing significant price differences. Oyster-based Travelcards can be used on National Rail throughout London. Pay as you go is available on a restricted, but increasing, number of routes.

Since the GLC days there has been a concessionary fare scheme for disabled and elderly London residents. This is in effect a free Annual All-Zones Travelcard; it is available for free travel on TfL-operated routes at all times for the disabled persons' version, and at all times except between 04:30–09:00 Monday to Friday for the elderly persons' version; it is also available on National Rail services within the London area, at all times except between 04:30–09:30 Monday to Friday for both versions. These permits are renewable bi-annually, in March of every even-numbered year; since 2006 the scheme has been called the "Freedom Pass" and the permit itself has been an Oyster Card.

For tourists or other non-residents, not needing to travel in the morning peak period, the all day travelcard is one of the better ticketing options available. These are available from any underground station. These cost around £5.50 and allow unlimited travel on the network from 9:30am onwards for the rest of the day. This provides excellent value for money and a huge saving considering one single journey on the network can cost close to £5. However for some travellers, it will be more advantageous to buy a Pay as You Go Oystercard; the issue of children complicates the fare structure for short-term visitors further, leading to a slew of websites attempting to help visitors through the ticketing system. Travel cards for multiple days are also available.

Penalty fares and fare evasion

In addition to automatic and staffed ticket gates, the Underground is patrolled by both uniformed and plain-clothes ticket inspectors with hand-held Oyster card readers. Passengers travelling without a ticket valid for their entire journey are required to pay a £50 (or £25 if paid within 21 days) penalty fare and can be prosecuted for fare evasion under the Regulation of Railways Act 1889 under which they are subject to a fine of up to £1,000, or three months' imprisonment. Oyster card pre-pay users who have failed to touch in at the start of their journey are charged the maximum cash fare (£4, or £5 at some National Rail stations) upon touching out. In addition, an Oyster card user who has failed to touch in at the start of their journey and who is detected mid-journey (i.e. on a train) by an Inspector is now liable to a penalty fare of £50, which is reduced to £25 if paid within 21 days. No £4 maximum charge will be applied to their destination as the inspector will apply an 'exit token' to their card.

While the Conditions of Carriage require period Travelcard holders to touch in and touch out at the start and end of their journey, any Oyster card user who has a valid period Travelcard covering their entire journey is not liable to pay a Penalty fare where they have not touched in. Neither the Conditions of Carriage or Schedule 17 of the Greater London Authority Act 1999, which shows how and when Penalty fares can be issued, would allow the issuing of a Penalty fare to a traveller who had already paid the correct fare for their journey.


Delays

According to statistics obtained under the Freedom of Information Act, the average commuter on the Metropolitan line wasted three days, 10 hours and 25 minutes in 2006 due to delays (not including missed connections). Between 17 September 2006 and 14 October 2006, figures show that 211 train services were delayed by more than 15 minutes. Passengers are entitled to a refund if their journey is delayed by 15 minutes or more due to circumstances within the control of TfL.

Hours of operation

Sign explaining improvement works.
This can be found inside every tube train.
The Underground does not run 24 hours a day (except at New Year and major public events - such as the Queen's Golden Jubilee in 2002 and the Opening and Closing Ceremonies of the London Olympics in 2012) because most lines have only two tracks (one in each direction) and therefore need to close at night for cleaning and planned maintenance work . First trains start operating from approximately quarter to five in the morning, generally for shorter journeys such as the Piccadilly Line's Osterley-Heathrow only rather than the full length of the line, with the remainder operating by 05:30, running until around 01:00. Unlike systems such as the New York City Subway, few segments of the Underground have third or fourth tracks that allow trains to be routed around maintenance sites. Recently, greater use has been made of weekend closures of parts of the system for scheduled engineering work.

Accessibility

Accessibility by people with mobility problems was not considered when most of the system was built, and most older stations are inaccessible to disabled people. More recent stations were designed for accessibility, but retrofitting accessibility features to old stations is at best prohibitively expensive and technically extremely difficult, and often impossible. Even when there are already escalators or lift, there are often steps between the lift or escalator landings and the platforms.

Most stations on the surface have at least a short flight of stairs to gain access from street level, and the great majority of below-ground stations require use of stairs or some of the system's 410 escalators (each going at a speed of per minute, approximately ). There are also some lengthy walks and further flights of steps required to gain access to platforms. The emergency stairs at Covent Gardenmarker station have 193 steps to reach the exit (equivalent to climbing to the top of a 15-floor building), so passengers are advised to use the lifts as climbing the steps can be dangerous.

The escalators in Underground stations include some of the longest in Europe, and all are custom-built. The longest escalator is at Angel stationmarker, long, with a vertical rise of . They run 20 hours a day, 364 days a year, with 95% of them operational at any one time, and can cope with 13,000 passengers per hour. Convention and signage stipulate that people using escalators on the Underground stand on the right-hand side so as not to obstruct those who walk past them on the left.

TfL produces a map indicating which stations are accessible, and since 2004 line maps indicate with a wheelchair symbol those stations that provide step-free access from street level. Step height from platform to train is up to , and there can be a large gap between the train and curved platforms. Only the Jubilee Line Extensionmarker is completely accessible.

TfL plans that by 2020 there should be a network of over 100 fully accessible stations, consisting of those recently built or rebuilt, and a handful of suburban stations that happen to have level access, along with selected 'key stations', which will be rebuilt. These key stations have been chosen due to high usage, interchange potential, and geographic spread, so that up to 75% of journeys will be achievable step-free.

Overcrowding

Overcrowding on the Underground has been of concern for years and is very much the norm for most commuters especially during the morning and evening rush hours. Stations which particularly have a problem include Camden Town stationmarker and Covent Gardenmarker, which have access restrictions at certain times. Restrictions are introduced at other stations when necessary. Several stations have been rebuilt to deal with overcrowding issues, with Clapham Common and Clapham North on the Northern line being the last remaining stations with a single narrow platform with tracks on both sides. On particularly busy occasions, such as football matches, British Transport Police may be present to help with overcrowding.

Some stations are closed or are made exit-only stations due to overcrowding in peak periods. At other times trains simply don't stop at the overcrowded station and go onto the next closest station, in places where there is another station within walking distance. Overcrowding can also be limited by temporarily disallowing passengers from passing through ticket gates to the platforms at some stations.

According to a 2003 House of Commons report, commuters faced a "daily trauma" and were forced to travel in "intolerable conditions".

Safety

Accidents on the Underground network, which carries around a billion passengers a year, are rare. There is one fatal accident for every 300 million journeys. There are several safety warnings given to passengers, such as the 'mind the gap' announcement and the regular announcements for passengers to keep behind the yellow line. Relatively few accidents are caused by overcrowding on the platforms, and staff monitor platforms and passageways at busy times prevent people entering the system if they become overcrowded.

Most fatalities on the network are suicides. Most platforms at deep tube stations have pits beneath the track, originally constructed to aid drainage of water from the platforms, but they also help prevent death or serious injury when a passenger falls or jumps in front of a train.

Design and the arts

TfL's Tube map and "roundel" logo are instantly recognisable by any Londoner, almost any Briton, and many people around the world. It has become a major pop culture symbol.

TfL licenses the sale of clothing and other accessories featuring its graphic elements and it takes legal action against unauthorised use of its trademarks and of the Tube map. Nevertheless, unauthorised copies of the logo continue to crop up worldwide.

Map

The original maps were often street maps with the lines superimposed, but as well as being visually complex, this produced problems of space, as central stations were far closer together than outlying ones.

The modern stylised Tube map evolved from a design by electrical engineer Harry Beck in 1933. It is characterized by a schematic non-geographical layout (thought to have been based on circuit diagrams) and the use of colour coding for lines.

The map is now considered a design classic; virtually every major urban rail system in the world now has a similar map, and many bus companies have also adopted the concept.

There are many references in culture to the map, including parodies of it using different station-names, particularly in London advertisements for unrelated products & services.

Typography

Edward Johnston designed TfL's distinctive sans-serif typeface, in 1916. The typeface is still in use today although substantially modified in 1979 by Eiichi Kono at Banks & Miles to produce "New Johnston". It is noted for the curl at the bottom of the minuscule (lower case) l, which other sans-serif typefaces have discarded, and for the diamond-shaped tittle on the lower case i and j, whose shape also appears in the full stop, and is the origin of other punctuation marks in the face. TfL owns the copyright to and exercises control over the New Johnston typeface, but a close approximation of the face exists in the TrueType computer font Paddington, and the Gill Sans typeface also takes inspiration from Johnston.

The roundel

A few of the Roundels used.
The origins of the roundel, in earlier years known as the 'bulls-eye' or 'target', are obscure. While the first use of a roundel in a London transport context was the 19th-century symbol of the London General Omnibus Company — a wheel with a bar across the centre bearing the word GENERAL — its usage on the Underground stems from the decision in 1908 to find a more obvious way of highlighting station names on platforms. The red circle with blue name bar was quickly adopted, with the word "UNDERGROUND" across the bar, as an early corporate identity. The logo was modified by Edward Johnston in 1919.

Each station displays the Underground roundel, often containing the station's name in the central bar, at entrances and repeatedly along the platform, so that the name can easily be seen by passengers on arriving trains.

The roundel has been used for buses and the tube for many years, and since TfL took control it has been applied to other transport types (taxi, trammarker, DLR, etc.) in different colour pairs. The roundel has to some extent become a symbol for London itself.

The 100th anniversary of the roundel was celebrated by TfL commissioning 100 news works that celebrate the design.

Contribution to arts

The Underground currently sponsors and contributes to the arts via its Platform for Art and Poems on the Underground projects. Poster and billboard space (and in the case of Gloucester Road tube stationmarker, an entire disused platform) is given over to artwork and poetry to "create an environment for positive impact and to enhance and enrich the journeys of ... passengers".

Its artistic legacy includes the employment since the 1920s of many well-known graphic designers, illustrators and artists for its own publicity posters. Designers who produced work for the Underground in the 1920s and 1930s include Man Ray, Edward McKnight Kauffer and Fougasse. In recent years the Underground has commissioned work from leading artists including R. B. Kitaj, John Bellany and Howard Hodgkin.

In architecture, Leslie Green established a house style for the new stations built in the first decade of the 20th century for the Bakerloo, Piccadilly and Northern lines which included individual Edwardian tile patterns on platform walls. In the 1920s and 1930s, Charles Holden designed a series of modernist and art-deco stations for which the Underground remains famous. Holden's design for the Underground's headquarters building at 55 Broadwaymarker included avant-garde sculptures by Jacob Epstein, Eric Gill and Henry Moore (his first public commission). Misha Black was appointed design consultant for the 1960s Victoria Line, contributing to the line's uniform look, while the 1990s extension of the Jubilee line featured stations designed by leading architects such as Norman Foster, Michael Hopkins, Will Alsop and Ian Ritchie. These architects were commissioned by Roland Paoletti, chief architect for the Jubilee Line Extension (JLE).

Many stations also feature unique interior designs to help passenger identification. Often these have themes of local significance. Tiling at Baker Streetmarker incorporates repetitions of Sherlock Holmes's silhouette. Tottenham Court Roadmarker features semi-abstract mosaics by Eduardo Paolozzi representing the local music industry at Denmark Streetmarker. Northern line platforms at Charing Crossmarker feature murals by David Gentleman of the construction of Charing Crossmarker itself.

In popular culture

Model of a London underground carriage in Miniland
The Underground has been featured in many movies and television shows, including Sliding Doors, Tube Tales and Neverwhere. The London Underground Film Office handles over 100 requests per month. The Underground has also featured in music such as The Jam's "Down in the Tube Station at Midnight" and in literature such as the graphic novel V for Vendetta. Popular legends about the Underground being haunted persist to this day.

After placing a number of spoof announcements on her web page, London Underground voiceover artiste Emma Clarke had further contracts cancelled in 2007.

The announcement "mind the gap", heard when trains stop at certain platforms, has also become a well known catchphrase, as well as a name of a band.

The Amateur Transplants have made a spoof of the song "Going Underground" by The Jam, and changed the name to London Underground. They sing about all the "bad things underground".

The London Underground map serves as a playing field for the conceptual game of Mornington Crescent, and the board game The London Game.

Records

  • Longest Journey without changing trains- Central Line from West Ruislip to Epping at 34.1 miles (54.9km) taking 1 hour 28 minutes.
  • Shortest Distance between stations- Leicester Square to Covent Garden at 0.16 miles (0.25km) on the Piccadilly Line.
  • Shortest Escalator- At Chancery Lane station at 30 ft (9.1m) with 50 steps.
  • Longest Escalator- At Angel station at 197 ft (60m) taking 80 seconds to complete to carry passengers up and down.
  • Deepest lift shaft- At Hampstead station at 181 ft. (55.2m).
  • Deepest Station- Contrary to popular belief, it's Hampsteadmarker at 221 ft (67.4m) below sea level.
  • Highest Station- Amersham at 490 ft (149.4m) above sea level.
  • Furthest Outpost- Chesham (formerly Ongar before the closure of the Epping to Ongar branch in 1994).
  • Longest distance between adjacent stations- Between Chalfont and Latimer and Chesham at 3.89 miles (6.26km).
  • Line serving the most stations- The District Line serving 60 stations.
  • Busiest Station- Kings Cross St Pancras with 87 million passengers passing each year.
  • Highest point above ground level- Dollis Brook viaduct on the Northern Line's Mill Hill East branch at 60 ft. (18.3m).
  • Only line to connect with an airport- The Piccadilly Line since 1977 has operated connections to Heathrow airport.
  • Shortest Line- The Waterloo and City line, connects between Waterloo and Bank with no intermediate stations at 1.5 miles (2.41km).
  • Least stations:Waterloo & City Line with 2


See also



References

  1. Wolmar 2004, p. 18.
  2. Wolmar 2004, p. 135.
  3. http://mic-ro.com/metro/table.html - Metrobits.org
  4. Green 1987, pp. 3–4.
  5. Green 1987, p. 5.
  6. , at p. 72
  7. Wolmar 2004, p. 4.
  8. Rose 2005.
  9. Wolmar 2004, pp.154–155.
  10. Wolmar 2004, p. 168.
  11. http://www.tfl.gov.uk/corporate/modesoftransport/londonunderground/history/1606.aspx
  12. http://www.time.com/time/magazine/article/0,9171,966071-2,00.html
  13. , at p.6
  14. http://www.ft.com/cms/s/0/d704fcd6-c4f1-11de-8d54-00144feab49a.html
  15. http://www.guardian.co.uk/business/2009/sep/29/london-underground-tube-lines
  16. http://www.moneysavinglondon.com/Travel-in-London/cheapest-ways-to-get-around-london.html
  17. Safety first. The Economist (23 October 2003) Retrieved 3 December 2006.
  18. Many of these tile patterns survive, though a significant number of these are now replicas –


Further reading

  • (and similar volumes covering other lines, published 1972-1976)


External links




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