The USRA Light Mountain was a

USRA standard The USRA standard locomotives and railroad cars were designed by the United States Railroad Administration, the nationalized rail system of the United States during World War I. 1,870 steam locomotives and over 100,000 railroad cars were built t ...

class of

steam locomotive A steam locomotive is a locomotive that provides the force to move itself and other vehicles by means of the expansion of steam. It is fuelled by burning combustible material (usually coal, Fuel oil, oil or, rarely, Wood fuel, wood) to heat ...

designed under the control of the

United States Railroad Administration The United States Railroad Administration (USRA) was the name of the nationalisation, nationalized railroad system of the United States between December 28, 1917, and March 1, 1920. It was the largest American experiment with nationalization, and ...

, the nationalized railroad system in the

United States The United States of America (USA), also known as the United States (U.S.) or America, is a country primarily located in North America. It is a federal republic of 50 U.S. state, states and a federal capital district, Washington, D.C. The 48 ...

during

World War I World War I or the First World War (28 July 1914 – 11 November 1918), also known as the Great War, was a World war, global conflict between two coalitions: the Allies of World War I, Allies (or Entente) and the Central Powers. Fighting to ...

. This was the standard light freight locomotive of the USRA types, and was of

4-8-2 Under the Whyte notation for the classification of steam locomotives, represents the wheel arrangement of four leading wheels, eight powered and coupled driving wheels and two trailing wheels. This type of steam locomotive is commonly known as ...

wheel arrangement In rail transport, a wheel arrangement or wheel configuration is a system of classifying the way in which wheels are distributed under a locomotive. Several notations exist to describe the wheel assemblies of a locomotive by type, position, and c ...

in the

Whyte notation The Whyte notation is a classification method for steam locomotives, and some internal combustion locomotives and electric locomotives, by wheel arrangement. It was devised by Frederick Methvan Whyte, and came into use in the early twenti ...

, or 2′D1′ in

UIC classification The UIC classification of locomotive axle arrangements, sometimes known as the German classification''The Railway Data File''. Leicester: Silverdale, 2000. p. 52. . or German system,Kalla-Bishop P.M. & Greggio, Luciano, ''Steam Locomotives'', Cr ...

. A total of 47 locomotives were built under the auspices of the USRA.

Original owners

USRA originals

Copies

None of the originals built by the USRA or any of the subsequent copies were preserved, being scrapped from 1943 to 1959.

References

* * * * USRA locomotives 4-8-2 locomotives ALCO locomotives Standard-gauge locomotives of the United States Railway locomotives introduced in 1918 Steam locomotives of the United States Freight locomotives Scrapped locomotives {{steam-loco-stub