Surry, Sussex & Southampton 2-6-2 "Prairie" Locomotives of the USA

Class Details by Steve Llanso of Sweat House Media

Class 20 (Locobase 11006)

Data from "Logging Locomotives", Record of Recent Construction #96 (Baldwin Locomotive Works, 1918), p. 7. See also DeGolyer, Vol 62, pp. 405+. Locobase 11663 for more information about the SS & S.Works numbers were 52587-52588 in November 1919 and 53795-53796 in October 1920.

Narrow-gauge Prairies were not speed merchants. Instead they were usually used on light-rail lines where the extra axles distributed the already low engine weight over even more wheels.

24 and 26 were sold to Gray Lumber Company when the SS & S closed in October 1927.

Specifications by Steve Llanso of Sweat House Media
Locobase ID11006
RailroadSurry, Sussex & Southampton
Number in Class1
Road Numbers20, 22, 24, 26
Number Built1
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase 7.75'
Engine Wheelbase20.75'
Ratio of driving wheelbase to overall engine wheebase 0.37
Overall Wheelbase (engine & tender)40.10'
Axle Loading (Maximum Weight per Axle)
Weight on Drivers39800 lbs
Engine Weight56450 lbs
Tender Light Weight36050 lbs
Total Engine and Tender Weight92500 lbs
Tender Water Capacity1700 gals
Tender Fuel Capacity (oil/coal)4 tons
Minimum weight of rail (calculated)22 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter37"
Boiler Pressure170 psi
Cylinders (dia x stroke)12" x 18"
Tractive Effort10123 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.93
Heating Ability
Firebox Area50 sq. ft
Grate Area13.20 sq. ft
Evaporative Heating Surface534 sq. ft
Superheating Surface
Combined Heating Surface534 sq. ft
Evaporative Heating Surface/Cylinder Volume226.64
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation2244
Same as above plus superheater percentage2244
Same as above but substitute firebox area for grate area8500
Power L13488
Power MT579.63

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