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An EMD SD40 is a 6-axle diesel locomotive built by General Motors Electro-Motive Division between January 1966 and August 1972. Power was provided by a 645E3 16-cylinder engine which generated . This locomotive shared the same common frame with the SD38, SD39, SDP40, and SD45. 856 examples of this locomotive model were built for Americanmarker railroads, 330 were built for Canadianmarker railroads, 72 were built for Mexicanmarker railroads, 6 were built for the Guinea-Boke Project, and 4 SD40Ms riding on 5'3" gauge trucks were exported to Brazil. The SD40 was succeeded by an upgraded Dash 2 version called the SD40-2. The very first test bed SD40, EMD 434, constructed on an SD35 frame in July 1964 was in active service until retired by Canadian National Railway in March 2009, albeit having been upgraded to an "SD40-2R", as Illinois Central 6071. 18 customized SD40s were built for the Illinois Central Railroad as model SD40A, using the longer SDP45 frame, which allowed for a larger 5000 gallon fuel tank.

The SD40E is an EMD SD50 or SD50s rebuilt by the Norfolk Southern Railway and derated to 3000 HP.


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