The EMD TR1 was a two-unit cow–calf diesel locomotive built by General Motors Electro-Motive Division of La Grange, Illinois, in 1941.

Two pairs were built for the Illinois Central Railroad, the only purchaser.

The locomotive units strongly resembled the EMD NW3, with a long frame, Blomberg B road trucks, and a large cab connected to a wide area of hood that tapered going forward.

The locomotives incorporated the machinery of the EMD FT in switcher locomotive bodywork; a V16 EMD 567 diesel engine of 1,350 horsepower (1,010 kW) in each unit.

The cow and calf units were semipermanently coupled together with a drawbar instead of couplers, in similar fashion to the FT's twin-unit sets.