The reference for locomotives and railcars
Southern Pacific classes F-3 and F-4
United States | 1921 | 65 produced
No. 3701, probably in Sacramento
No. 3701, probably in Sacramento
collection Taylor Rush

After the class F-1 2-10-2s, the Southern Pacific ordered 15 F-3 in 1921 from Lima. They had larger cylinders, a larger boiler and had a trailing truck booster like their predecessors. Like most SP steam locomotives, they were oil-fired. To improve running characteristics in curves, they got lateral motion boxes on the lead drivers.

Since the SP didn't want to use the name „Santa Fe” for this wheel arrangement and didn't have real Decapod locomotives, they called all their 2-10-2s “Decks” as short form for “Decapods”. In 1922, they ordered 50 very similar locomotives from Baldwin which were designated class F-4 and delivered in a single train.

All 15 F-3 were converted to coal burning in 1924. Between 1940 and 1944, they were converted back to oil burning. Both classes were retired between 1951 and 1958.

ManufacturerLima, Baldwin
Axle config2-10-2 (Santa Fé) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Wheelbase42 ft 4 in
Fixed wheelbase22 ft 10 in
Total wheelbase82 ft 7 1/2 in
Service weight385,900 lbs
Adhesive weight297,300 lbs
Total weight607,900 lbs
Axle load59,500 lbs
Water capacity12,000 us gal
Fuel capacity4,000 us gal (oil)
Power sourcesteam
Starting effort74,554 lbf
Booster10,800 lbf
Power Plant
Driver diameter63.5 in
Boiler pressure200 psi
Expansion typesimple
Cylinderstwo, 29 1/2 x 32 in
Grate area82.5 sq ft
Firebox area381 sq ft
Tube heating area4,722 sq ft
Evaporative heating area5,103 sq ft
Superheater area1,329 sq ft
Total heating area6,432 sq ft
Calculated Values
steam locomotive
last changed: 06/2024

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