The SW-1500 was such a popular switcher, that not even World War II could squelch the demand. EMD introduced the 1,500 h.p. locomotive in 1939 and production was halted between 1942 and 1945 by the War Production Board. The WPB placed restrictions on locomotive manufacturers during that time due to the war effort. By the time EMD stopped producing the SW-1500 in 1949, they had sold over 1,100 units.
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