The EMD MRS-1 is a type of diesel-electric road switcher locomotive built by General Motors Electro-Motive Division for the United States Army Transportation Corps (USATC) in 1952. They were built with multigauge trucks and to a narrow loading gauge for service anywhere in the world in the event of war. Thirteen of the locomotives were built, with serial numbers 15873–15885. At almost $500,000 each in 1952 dollars, more than three times the price of a standard locomotive of the period, these were very expensive locomotives. Declared un-needed for wartime operations in about 1970, they were then used on various military bases around the United States, with some serving on the Alaska Railroad. Five locomotives are preserved, three in operating condition.
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