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Southern Pacific class T-31
United States | 1912 | 10 produced
Locomotive Magazine, July 1915

The T-31 class consisted of ten Ten-wheelers built for the Southern Pacific in 1912. Their area of application were local and branch line passenger trains. In contrast to their predecessors, the locomotives had superheaters ex works. Boiler pressure was initially 200 and later 210 psi. They were phased out of passenger service in the 1940's and used in front of freight trains and for switching until the late 1950's. Today number 2353, which was operational again from 1996 to 2001, and number 2355, which is being cosmetically restored since 2008, are still existing.

Axle config4-6-0 (Ten-wheeler) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Wheelbase25 ft 10 in
Fixed wheelbase13 ft 10 in
Service weight208,000 lbs
Adhesive weight162,000 lbs
Total weight297,900 lbs
Axle load55,500 lbs
Water capacity12,000 us gal
Fuel capacity4,000 us gal (oil)
Power sourcesteam
Estimated power1,200 hp (895 kW)
Optimal speed21 mph
Starting effort36,569 lbf
Power Plant
Driver diameter63 in
Boiler pressure200 psi
Expansion typesimple
Cylinderstwo, 22 x 28 in
Grate area32.1 sq ft
Firebox area221 sq ft
Tube heating area2,181 sq ft
Evaporative heating area2,402 sq ft
Superheater area483 sq ft
Total heating area2,885 sq ft
Calculated Values
steam locomotive
last changed: 05/2023

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