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The main difference between rebuilt SD40 and genuine SD40-2 is that the latter use a longer frame and has longer front and rear porches, while the rebuilt SD40 have a shorter frame. A common product of rebuilding SD40s, and sometimes SD40-2s, is an SD40-3. The major addition denotes that the rebuilt unit or units as an SD40-3 is the addition of ...
The GMD SD40-2(W) is a Canadian-market version of the SD40-2 diesel–electric locomotive, built for the Canadian National Railway (CN) by the Diesel Division of General Motors of Canada Ltd. (formerly General Motors Diesel) of London, Ontario; 123 were constructed between May 1975 and December 1980.
It is a mechanically injected two-stroke diesel engine that used a Roots blower. The 16-184A was installed in some 110-foot (34 m) subchasers of the SC-497 class during World War II. The two 1,540 bhp (1,150 kW) 16-184A diesel engines driving two shafts produced a faster subchaser that achieved 21 knots. [67]
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.
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A significant number of non-SD40-2 locomotives (SD40, SD45, SD40T-2, and SD45T-2, and even some SD50s) have been rebuilt to the equivalent of SD40-2s with new or remanufactured engines and other subsystems, using salvaged locomotives as a starting point. Some of these rebuilds have been made using new 12-cylinder 710 engines in place of the ...
The M4+2 engine has a four-stroke piston and a two-stroke piston. The shaft of the four-stroke piston rotates twice as fast as the shaft of the two-stroke piston, and the two-stroke part always runs at half speed. This ensures that both parts work optimally regarding fuel consumption at all times.
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.