The USRA Light Pacific was a USRA standard

USRA standard

The USRA standard locomotives and railroad cars were designed by the United States Railroad Administration, the nationalised rail system of the United States during World War I. 1,856 steam locomotives and over 100,000 railroad cars were built to these designs during the USRA's tenure...

 class of steam locomotive

Steam locomotive

A steam locomotive is a railway locomotive that produces its power through a steam engine. These locomotives are fueled by burning some combustible material, usually coal, wood or oil, to produce steam in a boiler, which drives the steam engine...

 designed under the control of the United States Railroad Administration

United States Railroad Administration

The United States Railroad Administration was the name of the nationalized railroad system of the United States between 1917 and 1920. It was possibly the largest American experiment with nationalization, and was undertaken against a background of war emergency.- Background :On April 6, 1917, the...

, the nationalized railroad system in the United States

United States

The United States of America is a federal constitutional republic comprising fifty states and a federal district...

 during World War I

World War I

World War I , which was predominantly called the World War or the Great War from its occurrence until 1939, and the First World War or World War I thereafter, was a major war centred in Europe that began on 28 July 1914 and lasted until 11 November 1918...

. This was the standard light passenger locomotive of the USRA types, and was 4-6-2

4-6-2

4-6-2, in the Whyte notation for the classification of steam locomotives, represents the wheel arrangement of four leading wheels on two axles , six powered and coupled driving wheels on three axles, and two trailing wheels on one axle .These locomotives are also known as Pacifics...

 wheel arrangement in the Whyte notation

Whyte notation

The Whyte notation for classifying steam locomotives by wheel arrangement was devised by Frederick Methvan Whyte and came into use in the early twentieth century encouraged by an editorial in American Engineer and Railroad Journal...

, or 2′C1′ in UIC classification

UIC classification

The UIC classification of locomotive axle arrangements describes the wheel arrangement of locomotives, multiple units and trams. It is set out in the International Union of Railways "Leaflet 650 - Standard designation of axle arrangement on locomotives and multiple-unit sets". It is used in much...

.

A total of 81 locomotives were built under USRA control; these were sent to the following railroads:

Table of original USRA allocation

Railroad	Quantity	Class	Road numbers	Notes
Atlantic Coast Line Railroad Atlantic Coast Line Railroad The Atlantic Coast Line Railroad was an American railroad that existed between 1900 and 1967, when it merged with the Seaboard Air Line Railroad, its long-time rival, to form the Seaboard Coast Line Railroad...	45	P-5-A	1500–1569	Also 25 copies
Baltimore and Ohio Railroad Baltimore and Ohio Railroad The Baltimore and Ohio Railroad was one of the oldest railroads in the United States and the first common carrier railroad. It came into being mostly because the city of Baltimore wanted to compete with the newly constructed Erie Canal and another canal being proposed by Pennsylvania, which...	30	P-5	5200–5229
Louisville and Nashville Railroad Louisville and Nashville Railroad The Louisville and Nashville Railroad was a Class I railroad that operated freight and passenger services in the southeast United States.Chartered by the state of Kentucky in 1850, the L&N, as it was generally known, grew into one of the great success stories of American business...	6	K-5	240–245	Also 20 copies
Total	81

After the dissolution of the USRA, all three railroads ordered additional copies of the USRA Light Pacific design, while the Grand Trunk Western Railroad

Grand Trunk Western Railroad

The Grand Trunk Western Railroad is an important subsidiary of the Canadian National Railway , constituting the majority of CN's Chicago Division ....

 and the Mobile and Ohio Railroad

Mobile and Ohio Railroad

The Mobile and Ohio Railroad was a railroad in the Southern U.S. The M&O was chartered in January and February 1848 by the states of Alabama, Kentucky, Mississippi, and Tennessee. It was planned to span the distance between the seaport of Mobile, Alabama and the Ohio River near Cairo, Illinois...

ordered only copies.