The reference for locomotives and railcars
US Railroad Administration Light Santa Fé
Southern Railway (USA) class Ss-1, Seaboard Air Line class B-1, Boston & Albany class Z-1, Duluth, Missabe & Northern class E-1 and Ann Arbor class L
United States | 1918 | 94 produced
Southern Railway Ss-1 No. 5200
Southern Railway Ss-1 No. 5200

The USRA Light Santa Fe was produced in smaller numbers than its heavy sister. Compared to this, it had drivers which were six inches smaller and a cylinder diameter that was three inches smaller. It shared the firebox design and the number of boiler tubes with the 2-6-6-2 Mallet, but the combustion chamber and the tubes were shorter.

Of 94 Light Santa Fes built, 75 came from ALCO and 19 from Baldwin. The biggest operator was the Southern, which used 50 of them as class Ss-1. The Seaboard Air Line got 15, the Boston & Albany and Duluth, Missabe & Northern got ten each, the Chicago & Western Indiana five and the Ann Arbor four.

ManufacturerALCO, Baldwin
Axle config2-10-2 (Santa Fé) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Length loco52 ft 10 in
Wheelbase40 ft 4 in
Fixed wheelbase21 ft
Total wheelbase75 ft 11 1/2 in
Service weight352,000 lbs
Adhesive weight274,000 lbs
Total weight540,300 lbs
Axle load60,000 lbs
Water capacity10,000 us gal
Fuel capacity32,000 lbs (coal)
Power sourcesteam
Estimated power3,600 hp (2,685 kW)
Optimal speed33 mph
Starting effort69,575 lbf
Power Plant
Driver diameter57 in
Boiler pressure200 psi
Expansion typesimple
Cylinderstwo, 27 x 32 in
Grate area76.3 sq ft
Firebox area373 sq ft
Tube heating area4,293 sq ft
Evaporative heating area4,666 sq ft
Superheater area1,085 sq ft
Total heating area5,751 sq ft
Calculated Values
steam locomotive
last changed: 05/2024

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