Milwaukee Road class ES-1

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Milwaukee Road class ES-1
Milwaukee ES-1.jpg
Type and origin
Power type Electric
Builder General Electric
Serial number 4986
Build date April 1915
Total produced 1
 • AAR B-B
 • UIC Bo′Bo′
Gauge 4 ft 8 12 in (1,435 mm) standard gauge
Loco weight 98,900 lb (44,900 kg; 44.9 t)
Electric system(s) 1,500 V DC
Performance figures
Power output 316 hp (236 kW) continuous
Operators Milwaukee Road
Class ES-1
  • 10000
  • E85 from March 1939
Retired November 1939

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.


  • Edson, William D. (Spring 1977). "Milwaukee Road All Time Steam, Diesel and Electric Roster". Railroad History. Boston, Massachusetts: Railway and Locomotive Historical Society Inc. (136): 115.