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The Milwaukee Road's ES-1 electric locomotive No. 10000, circa 1914.

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The Milwaukee Road's ES-1 electric locomotive No. 10000, circa 1914.
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Milwaukee Road class ES-1

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.

Milwaukee Road Class ES-1 Overview
Type and origin
Power type: Electric
Builder: General Electric
Serial number: 4986
Build date: April 1915
Total produced: 1

Specifications
AAR wheel arrangement: B-B
UIC class: Bo′Bo′
Gauge: 4 ft 8 1⁄2 in (1,435 mm) standard gauge
Locomotive weight: 98,900 lb (44,900 kg; 44.9 t)
Electric system: 1,500 V DC

Performance figures
Power output: 316 hp (236 kW) continuous

Career
Operator: Milwaukee Road
Class: ES-1
Numbers: 10000, E85 from March 1939
Retired: November 1939