EMD SW1

The EMD SW1 was a 600-horsepower (450 kW) diesel-electric switcher locomotive built by General Motors Electro-Motive Division between December 1938 and November 1953. Final assembly was at EMD's plant at La Grange, Illinois. The SW1 was the second generation of 600 hp switcher from EMD, succeeding the SW and SC. The most significant change from those earlier models was the use of an engine of EMD's own design, the EMD 567 engine, here in 600 hp (450 kW) V6 form. 661 locomotives of this design were built, even though diesel switcher production was suspended between 1942 and 1945 by the War Production Board.