An SD39 is a 6-axle diesel-electric locomotive built by General Motors Electro-Motive Division between August 1968 and May 1970. 54 were built for American railroads.In 1966 EMD replaced all their old models with new ones having the new 645 diesel. These included six-axle models SD38 SD40 SDP40 and SD45; the SD39 was added in 1968. All shared standard components including the frame cab traction alternator trucks traction motors and air brakes.
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