High Quality Content by WIKIPEDIA articles! The EMD MRS-1 is a type of diesel-electric 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.