The E8 is a 2,250-horsepower passenger train locomotive built by General Motors' Electro-Motive Division (EMD) of La Grange, Illinois. The E8 was the ninth model in the line of passenger diesels of similar design known as EMD E-units.

The E9 was the tenth and last model of EMD E-unit and differed from the earlier E8 as built only by the newer engines and a different, flusher fitting mounting for the headlight glass, this glass being the only visible difference. Since some E8s were fitted with this, it is not a reliable way to distinguish the two.