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Great Northern (US) class S-2
United States | 1930 | 14 produced
No. 2576 in front of 2579 im September 1946 in St. Paul, Minnesota
No. 2576 in front of 2579 im September 1946 in St. Paul, Minnesota
Len Hillyard / collection Taylor Rush

Compared to the S-1, the locomotives of the S-2 class received larger driving wheels with a diameter of 80 inches, as they were only intended for express trains. They also burned oil and now had cylinders measuring 29 by 29 inches. They showed up more than 50,000 pounds less on the scales thanks to a smaller boiler. Since the adhesive weight was also reduced as a result, the locomotives slipped more quickly when starting and had to be operated with great care. Nevertheless, from 1949 they were no longer needed for express trains such as the “Empire Builder” and also had to pull freight trains.

General
Built1930
ManufacturerBaldwin
Axle config4-8-4 (Northern) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Wheelbase47 ft 9 in
Fixed wheelbase20 ft 9 in
Total wheelbase91 ft 2 in
Service weight420,900 lbs
Adhesive weight247,300 lbs
Total weight747,460 lbs
Axle load61,825 lbs
Water capacity17,250 us gal
Fuel capacity5,800 us gal (oil)
Power
Power sourcesteam
Estimated power4,500 hp (3,356 kW)
Optimal speed49 mph
Starting effort58,305 lbf
Power Plant
Driver diameter80 in
Boiler pressure225 psi
Expansion typesimple
Cylinderstwo, 29 x 29 in
Boiler
Grate area97.8 sq ft
Firebox area401 sq ft
Tube heating area4,380 sq ft
Evaporative heating area4,781 sq ft
Superheater area2,265 sq ft
Total heating area7,046 sq ft
Calculated Values
steam locomotive
express
last changed: 04/2023
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