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Atlantic Coast Line Class USRA Light Pacific P-5-A 4-6-2 No. 1504, built 1919.

During the World-War Emergency, American railroads were placed under the control of the United States Railroad Administration (USRA) to facilitate construction, operation, and maintenance. All new steam locomotives ordered during this period were built to one of twelve standard designs developed by a committee composed of USRA, railroad, and locomotive-builder representatives. This family of locomotives, ranging from 0-6-0 to 2-8-8-2 in size, incorporated the best proven features of the day and was the first successful standardization of American motive power. Although the USRA period lasted only three years, locomotives continued to be built around these basic designs for another decade. ACL 1504, built by American Locomotive Co. Richmond Works, is a "Light Pacific," the most common USRA passenger design. It was in service on ACL for 30 years, and has survived in almost original condition.    By Timdwilliamson - Own work, CC BY-SA 4.0, https://commons.wikimedia.org/w/index.php?curid=47695647

United States Railroad Administration Locomotive Atlantic Coast Line Class P-5-A 4-6-2 No. 1504, built 1919.

Canadian National Railways Class J-7b 4-6-2 No. 5288 (MLW No.60483 of 1919) which was built to the USRA Light Pacific design. 45 J-4a & b's were built by MLW 1918-19 for the Canadian Government Railway (withdrawn 1957-61) which became a constituent of the CN; 10 J-7c's were built by MLW for Canadian National Railways (withdrawn 1959-61). No. 5288 is shown here at at Steamtown, Bellows Falls, Vermont, in August of 1970.

Hugh Llewelyn [CC BY-SA 2.0 (http://creativecommons.org/licenses/by-sa/2.0)], via Wikimedia Commons

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Canadian National Railways Class J-7b 4-6-2 No. 5288.
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USRA Light Pacific 4-6-2 Steam Locomotive
The USRA Light Pacific was a USRA standard class of steam locomotive designed under the control of the United States Railroad Administration, the nationalized railroad system in the United States during World War I. This was the standard light passenger locomotive of the USRA types, and was 4-6-2 wheel arrangement in the Whyte notation, or 2′C1′ in UIC classification.

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

Original USRA Allocation List:

Atlantic Coast Line Railroad
Quantity: 45
Class: P-5-A
Road numbers: 1500–1569
Notes: Also 25 copies.

Baltimore and Ohio Railroad
Quantity: 30
Class: P-5
Road numbers: 5200–5229

Louisville and Nashville Railroad
Quantity: 6
Class: K-5
Road numbers: 240–245
Notes: 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 and the Mobile and Ohio Railroad ordered only copies.

Atlantic Coast Line Railroad number 1504 is the only surviving USRA standard light pacific, it is currently under restoration in Jacksonville Florida.

USRA Light Pacific Overview
Type and origin
Power type: Steam
Builders:
American Locomotive Company, Baldwin Locomotive Works
Build date: 1919–1920
Total produced: 81, plus copies
Specifications
Configuration: 4-6-2
UIC class: 2′C1′ h2
Gauge: 4 ft 8 1⁄2 in (1,435 mm)
Driver diameter: 73 in (1,854 mm)
Wheelbase Coupled: 13 ft 0 in (3.96 m)
Wheelbase Locomotive: 34 ft 9 in (10.59 m)
Wheelbase Locomotive and Tender: 68 ft 7 1⁄2 in (20.92 m)
Axle load: 55,000 lb (25,000 kilograms)
Adhesive weight: 165,000 lb (75,000 kilograms)
Locomotive weight: 270,000 lb (120,000 kilograms)
Tender weight: 144,000 lb (65,000 kilograms)
Total weight: 414,000 lb (188,000 kilograms)
Firebox:
 • Firegrate area: 66.7 sq ft (6.20 m2)
Boiler pressure: 200 lbf/in2 (1.38 MPa)
Heating surface: 3,333 sq ft (309.6 m2)
 • Tubes: 2,091 sq ft (194.3 m2)
 • Flues: 981 sq ft (91.1 m2)
 • Firebox: 234 sq ft (21.7 m2)
Superheater:
​ • Heating area: 794 sq ft (73.8 m2)
Cylinders: Two
Cylinder size: 25 in × 28 in (635 mm × 711 mm)
Valve type: 14-inch (356 mm) piston valves
Performance figures
Tractive effort: 40,700 lbf (181.0 kN)
Factor of adhesion: 4.1

See also:

USRA Heavy Pacific

4-6-2 Pacific Locomotives

Steam Locomotives

Locomotives