GP38 Diesel Locomotive

Prototype Information

The GP38, first built in January 1966, was constructed with 16-645 prime mover and a D32 direct current (DC) generator, similar to all the other locomotives produced previously by EMD. The push to higher horsepower, however, necessitated larger DC generators and in 1971 EMD introduced a new option for the GP38 – an AR10 alternating current (AC) alternator in place of the generator. This was a solution to the space problems encountered by the large generator, because alternators were smaller, yet offered the same electrical capacity. And thus was born the GP38AC, which are externally identical to the GP38.

The GP38 was a popular engine, filling a niche for railroads requiring a locomotive for lighter duty and for use on trackage that was often not for high-speed mainline trains. As such it was purchased for a number of shortlines and a small number of industrial users. As a number of Class I railroads operate a lot of branch lines, the GP38 was also popular with these larger railroads as well.

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