USRA Light Pacific

Specifications
Specifications
Configuration:;
• Whyte	4-6-2
• UIC	2′C1′ h2
Gauge	4 ft 8+1⁄2 in (1,435 mm)
Driver dia.	73 in (1,854 mm)
Wheelbase	Coupled: 13 ft 0 in (3.96 m); Locomotive: 34 ft 9 in (10.59 m); Loco & 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)
Loco weight	270,000 lb (120,000 kilograms)
Tender weight	144,000 lb (65,000 kilograms)
Total weight	414,000 lb (188,000 kilograms)
Firebox:
• Grate area	66.7 sq ft (6.20 m2)
Boiler pressure	200 lbf/in2 (1.38 MPa)
Heating surface:
• Firebox	234 sq ft (21.7 m2)
• Tubes	2,091 sq ft (194.3 m2)
• Flues	981 sq ft (91.1 m2)
• Total surface	3,333 sq ft (309.6 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

Type and origin
Type and origin
Power type	Steam
Builder	American Locomotive Company; Baldwin Locomotive Works;
Build date	1919–1920
Total produced	81, plus copies

USRA Light Pacific
USRA Light Pacific
Power type
Type and origin
Power type	Steam
Builder	American Locomotive Company; Baldwin Locomotive Works;
Build date	1919–1920
Total produced	81, plus copies
Configuration:;
Specifications
Configuration:;
• Whyte	4-6-2
• UIC	2′C1′ h2
Gauge	4 ft 8+1⁄2 in (1,435 mm)
Driver dia.	73 in (1,854 mm)
Wheelbase	Coupled: 13 ft 0 in (3.96 m); Locomotive: 34 ft 9 in (10.59 m); Loco & 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)
Loco weight	270,000 lb (120,000 kilograms)
Tender weight	144,000 lb (65,000 kilograms)
Total weight	414,000 lb (188,000 kilograms)
Firebox:
• Grate area	66.7 sq ft (6.20 m2)
Boiler pressure	200 lbf/in2 (1.38 MPa)
Heating surface:
• Firebox	234 sq ft (21.7 m2)
• Tubes	2,091 sq ft (194.3 m2)
• Flues	981 sq ft (91.1 m2)
• Total surface	3,333 sq ft (309.6 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
Tractive effort
Performance figures
Tractive effort	40,700 lbf (181.0 kN)
Factor of adh.	4.1

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:

Table of original USRA allocation^[1]
Railroad	Quantity	Class	Road numbers	Notes
Atlantic Coast Line Railroad	45	P-5-A	1500–1569	Also 25 copies^[2]
Baltimore and Ohio Railroad	30	P-5	5200–5229	^[3]
Louisville and Nashville Railroad	6	K-5	240–245	Also 20 copies^[4]
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.

References

^ "USRA Locomotives". Steamlocomotive.com. Retrieved 2009-02-19.
^ Drury pp.33, 37
^ Drury pp.43, 47
^ Drury pp.228, 230

Drury, George H. (1993), Guide to North American Steam Locomotives, Waukesha, Wisconsin: Kalmbach Publishing Company, ISBN 0-89024-206-2, LCCN 93041472

[1] "USRA Locomotives". Steamlocomotive.com. Retrieved 2009-02-19.

[2] Drury pp.33, 37

[3] Drury pp.43, 47

[4] Drury pp.228, 230

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[2]

[3]

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v t e USRA locomotives
Switchers	0-6-0 0-8-0
Light	2-8-2 2-10-2 4-6-2 4-8-2
Heavy	2-8-2 2-10-2 4-6-2 4-8-2
Articulated	2-6-6-2 2-8-8-2