The Milwaukee Road's class ES-1 comprised a single electric switcher locomotive built in 1915. It was designed to run on the unique 1,500 V DC 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. 136 (136). Boston, Mass.: Railway and Locomotive Historical Society: 115. JSTOR 43523968.