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The EMD SD40 is an American 6-axle diesel-electric locomotive built by General Motors Electro-Motive Division between January 1966 and August 1972. 1,268 locomotives were built between 1966 and 1972. In 1972, an improved version with new electronics was developed and marketed as a new locomotive, the SD40-2 .
Although higher-horsepower locomotives were available, including EMD's own SD45-2, the reliability and versatility of the 3,000-horsepower (2,200 kW) SD40-2 made it one of the best-selling models in EMD's history, edged out only by the GP9, and was the standard of the industry for several decades after its introduction.
This is a summary, listing every diesel locomotive from the SD40-series in preservation. This list includes the models SD40 , SDP40 , SD40A , SD40-2 , SDP40F , SD40T-2 , SD40-2W , SD40-2S . SD40
The SD40T-2 is a model of diesel-electric locomotive built by General Motors Electro-Motive Division in the United States. The SD40T-2 is equipped with a 16-cylinder EMD 645E3 diesel engine producing 3,000 horsepower (2,240 kW). 312 SD40T-2s were built for three railroads in the United States between April 1974 and July 1980.
The SD40A was designed as an EMD SD40 built on a frame of an EMD SDP45. The longer SDP45 frame allowed for a larger, 5000 gallon fuel tank. [1] This locomotive is powered by a 16-cylinder EMD 645E3 diesel engine, which could provide 3,000 horsepower (2,240 kW).
The EMD SD40X is a 6-axle experimental diesel-electric locomotive built by General Motors Electro-Motive Division between 1964 and 1965. Nine examples of this locomotive were built for test purposes to test the new 645-series prime mover 16-645E3.
The main difference was the power: the SD38 produced 2,000 hp (1,490 kW) from a non-turbocharged V16, the SD40 produced 3,000 hp (2,240 kW) from a turbocharged V16, and the SD45 produced 3,600 hp (2,680 kW) from a turbocharged V20. The SD40 and SDP40 were so similar that EMD published common operator's and service manuals to cover both.
It is the result of a conversion to an existing EMD SD40-2-type locomotive. This involves replacing the existing prime mover with an EPA Tier-II -compliant turbocharged V16 Caterpillar 3516. [ 1 ] The prime mover is equipped with an additional exhaust treatment system, in a large box mounted at hood top level, in front of the radiator section.