Surry, Sussex & Southampton 2-6-2 "Prairie" Locomotives in 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.

Principal Dimensions by Steve Llanso of Sweat House Media
Class20
Locobase ID11,006
RailroadSurry, Sussex & Southampton
CountryUSA
Whyte2-6-2
Number in Class1
Road Numbers20, 22, 24, 26
Gauge3'
Number Built1
BuilderBaldwin
Year1916
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m) 7.75 / 2.36
Engine Wheelbase (ft / m)20.75 / 6.32
Ratio of driving wheelbase to overall engine wheebase 0.37
Overall Wheelbase (engine & tender) (ft / m)40.10 / 12.22
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)39,800 / 18,053
Engine Weight (lbs / kg)56,450 / 25,605
Tender Loaded Weight (lbs / kg)36,050 / 16,352
Total Engine and Tender Weight (lbs / kg)92,500 / 41,957
Tender Water Capacity (gals / ML)1700 / 6.44
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)4 / 3.60
Minimum weight of rail (calculated) (lb/yd / kg/m)22 / 11
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)37 / 940
Boiler Pressure (psi / kPa)170 / 11.70
High Pressure Cylinders (dia x stroke) (in / mm)12" x 18" / 305x457
Tractive Effort (lbs / kg)10,123 / 4591.72
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.93
Heating Ability
Firebox Area (sq ft / m2)50 / 4.65
Grate Area (sq ft / m2)13.20 / 1.23
Evaporative Heating Surface (sq ft / m2)534 / 49.63
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)534 / 49.63
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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