The Milwaukee Road's class ES-2 comprised four electric

Electric locomotive

An electric locomotive is a locomotive powered by electricity from overhead lines, a third rail or an on-board energy storage device...

 switcher

Switcher

A switcher or shunter is a small railroad locomotive intended not for moving trains over long distances but rather for assembling trains ready for a road locomotive to take over, disassembling a train that has been...

 locomotive

Locomotive

A locomotive is a railway vehicle that provides the motive power for a train. The word originates from the Latin loco – "from a place", ablative of locus, "place" + Medieval Latin motivus, "causing motion", and is a shortened form of the term locomotive engine, first used in the early 19th...

s . Two were built in 1916

1916 in rail transport

-April events:* April - Motor Rail deliver the first of over 900 petrol engined 60 cm narrow gauge railway locomotives for the British War Department Light Railways on the Western Front ; substantially the same design is in production until the 1980s....

 and the final two in 1919

1919 in rail transport

-March events:* March 5 – Rebuilt Helsinki Central railway station officially opened .-April events:* April 12 – Ryutaro Nomura succeeds Simbei Kunisawa for a second term as president of South Manchuria Railway....

. They were of steeplecab

Steeplecab

In railroad terminology, a steeplecab is a style or design of electric locomotive; the term is rarely if ever used for other forms of power...

 design, with a single roof-mounted pantograph

Pantograph (rail)

A pantograph for rail lines is a hinged electric-rod device that collects electric current from overhead lines for electric trains or trams. The pantograph typically connects to a one-wire line, with the track acting as the ground wire...

 to access the Milwaukee's 3,000 V DC

Direct current

Direct current is the unidirectional flow of electric charge. Direct current is produced by such sources as batteries, thermocouples, solar cells, and commutator-type electric machines of the dynamo type. Direct current may flow in a conductor such as a wire, but can also flow through...

 overhead line. Originally numbered 10050–10053, they were renumbered E80–E83 in March 1939. The E80 was the Deer Lodge, Montana

Deer Lodge, Montana

Deer Lodge is a city in and the county seat of Powell County, Montana, United States. The population was 3,421 at the 2000 census. The city is perhaps best known as the home of the Montana State Prison, a major local employer...

switcher.