Milwaukee Road class ES-1

Type and origin
Power type	Electric
Builder	General Electric
Serial number	4986
Build date	April 1915
Total produced	1

Specifications
AAR wheel arr.	B-B
UIC class	Bo′Bo′
Gauge	4 ft 8 ¹⁄₂ 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

Career
Operators	Milwaukee Road
Class	ES-1
Numbers	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.

References

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.

Electric locomotive classes of the Milwaukee Road

EF-1 EF-2 EF-3 (boxcab) EF-4/EP-4 (Little Joe) EF-5 EP-1 EP-2 (bi-polar) EP-3 (quill) ES-1 ES-2

Electric locomotives built by GE

DC Electrics (Bipolar motors)	NYC S-Motor NYC T-Motor MILW EP-2 “Bi-polar”

DC Electrics	CN Boxcab Electric MILW EF-1 / EP-1 MILW ES-1 MILW ES-2 GE 289A Boxcab Mexican Railway Boxcabs NYC P Motor NYC R-Motor NYC Q-Motor CUT P1-a NYC R-2 Paulista Rwy. 2-C+C-2 “Little Joe” CN Centercab Electric NJ E-10

AC Electrics	New Haven EP3 PRR P5a PRR GG1 New Haven EP4 New Haven EF3a PRR E2b

AC Electrics (3 phase)	GN boxcab

AC Electrics (motor generator)	New Haven EF2 New Haven EY3 GN Y-1 / PRR FF2 GN W-1 VGN EL-2B

AC Electrics (Ignitron Rectifier)	New Haven EP5 VGN EL-C (PC E33) PRR E44

AC Electrics (Silicon Rectifier)	E50C E60C E60CH / E60CP E25B E60C-2

(see also: List of GE locomotives)

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