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The Milwaukee Road's class ES-1 comprised a single electricswitcherlocomotive built in 1915. It was designed to run on the unique 1,500 VDC electrification in the yard at Great Falls, Montana. It was originally numbered #10000 and was numbered E85 in March 1939. It was retired in November 1939.
References[]
Edson, William D. (Spring 1977). "Milwaukee Road Locomotives". Railroad History. Boston, Mass.: Railway and Locomotive Historical Society. 136: 115. JSTOR43523968.