The EMD SW1 was a 600-horsepower (450 kW) diesel-electric switcher locomotive built by General Motors’ Electro-Motive Corporation (later Division) between December 1938 and November 1953. Final assembly was at EMD’s plant at LaGrange (McCook) Illinois. The SW1 was the second generation of 600 hp switcher from EMD succeeding the SC (cast frame) and SW (welded frame).
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