Three new General Motors EMD SD40-2 locomotives are seen at McCook, Illinois, in September 1972, the first two awaiting delivery to the Ferrocarriles Nacionales de México or National Railways of Mexico, the third for the Chessie system. The SD40-2 was a standard workhorse of North American railways of the 1970s through the 1990s and 3,957 were produced between 1972 and 1989. They had an EMD 16-645-E3 prime mover, V16, turbocharged, which produced 3,000 hp (2,240 kW) powering traction motors on each of the six axles, thus a Co-Co type. Length over couplers was 68'10" or 21 metres.
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