The EMD LWT12 was a diesel–electric power car that was built in 1955 by General Motors Electro-Motive Division (EMD), to pull a lightweight passenger trainset. The General Motors Company developed both components under the project name, Train Y, but later marketed them as the Aerotrain. Diesel power was provided by an EMD 567C 12-cylinder engine, which produced 1,200 hp (890 kW). Two other GM Diesel engines provided current for train-heating, lighting and air-conditioning.