USRA Light Pacific

USRA Light Pacific
Type and origin
Power type Steam
Builder
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 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:
 • 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 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

  1. ↑ "USRA Locomotives". Steamlocomotive.com. Retrieved 2009-02-19.
  2. ↑ Drury pp.33, 37
  3. ↑ Drury pp.43, 47
  4. ↑ Drury pp.228, 230
  • Drury, George H. (1983), Guide to North American Steam Locomotives, Waukesha, Wisconsin: Kalmbach Publishing Company, ISBN 0-89024-206-2, LCCN 93041472 
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