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US Railroad Administration Light Pacific
United States | 1919 | 106 produced
collection Fernando Luna

While the USRA Heavy Pacific was designed for express trains, the Light Pacific had a six inch smaller driver diameter and was primarily intended for passenger trains. With a maximum axle load of 54,000 pounds, it was also suitable for branch lines. Its usual services included hauling ten to twelve coaches at a speed of 70 to 80 mph (113 to 129 km/h). 106 of the original model were built, of which 70 went to the Atlantic Coast Line and were designated class P-5-A. 30 went to the Baltimore & Ohio and six to the Louisville & Nashville. Later copies also included 165 P-5-B for the ACL, while other railroads only procured smaller numbers.

General
Built1919-1920
ManufacturerALCO, Baldwin
Axle config4-6-2 (Pacific) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Wheelbase34 ft 9 in
Fixed wheelbase13 ft
Service weight277,000 lbs
Adhesive weight162,000 lbs
Total weight471,000 lbs
Axle load54,000 lbs
Water capacity10,000 us gal
Fuel capacity32,000 lbs (coal)
Power
Power sourcesteam
Estimated power2,300 hp (1,715 kW)
Optimal speed36 mph
Starting effort40,753 lbf
Power Plant
Driver diameter73 in
Boiler pressure200 psi
Expansion typesimple
Cylinderstwo, 25 x 28 in
Boiler
Grate area66.7 sq ft
Firebox area261 sq ft
Tube heating area3,072 sq ft
Evaporative heating area3,333 sq ft
Superheater area794 sq ft
Total heating area4,127 sq ft
Calculated Values
steam locomotive
passenger
express
last changed: 08/2023
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