The EMD SW7 was a diesel switcher locomotive built by General Motors Electro-Motive Division between October 1949 and January 1951.

[2] It was powered by a 1,200 horsepower (895 kW)12-567A engine.

[1] The SW7 replaced the earlier 1,000 horsepower NW2 switcher in EMD's catalog.

The majority of the SW7s were built by EMD Plant #3 in Cleveland, Ohio.

[citation needed] In addition, 15 TR4 cow–calf paired sets were produced.