The reference for locomotives and railcars


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Southern Pacific class S-12
United States | 1919 | 38 produced
No. 1261 in April 1956 in Fresno, California
No. 1261 in April 1956 in Fresno, California
J.A. Strapac Collection
No. 137 on a works photo
No. 137 on a works photo
Baldwin / collection Taylor Rush

After some 0-6-0 switchers, which the Southern Pacific had received from several manufacturers, they built more in their own shops. Six of the class, designated S-12, were built between 1919 and 1921 in Los Angeles and 32 in Sacramento. At least some of the locomotives were oil-fired, as the technical data shows. Their service ended between 1949 and 1952.

ManufacturerLos Angeles, Sacramento
Axle config0-6-0 (Six-coupled) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Service weight153,000 lbs
Adhesive weight153,000 lbs
Total weight291,100 lbs
Axle load38,250 lbs
Water capacity7,000 us gal
Fuel capacity2,940 us gal (oil)
Power sourcesteam
Starting effort31,018 lbf
Power Plant
Driver diameter57 in
Boiler pressure200 psi
Expansion typesimple
Cylinderstwo, 20 x 26 in
Calculated Values
steam locomotive
last changed: 11/2023

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