Data from "Logging Locomotives", Record of Recent Construction #96 (Baldwin Locomotive Works, 1918), p. 7. See also DeGolyer, Volume 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 Middle Run Media | |
|---|---|
| Class | 20 |
| Locobase ID | 11006 |
| Railroad | Surry, Sussex & Southampton |
| Country | USA |
| Whyte | 2-6-2 |
| Number in Class | 1 |
| Road Numbers | 20, 22, 24, 26 |
| Gauge | 3' |
| Number Built | 1 |
| Builder | Baldwin |
| Year | 1916 |
| Valve Gear | Walschaert |
| 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 wheelbase | 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 / Liters/MT) | 4 / 4 |
| 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 / 1170 |
| 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 | |
| Tubes (number - dia) (in / mm) | 81 - 2" / 51 |
| Flues (number - dia) (in / mm) | |
| Flue/Tube length (ft / m) | 11.50 / 3.51 |
| 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 Volume | 226.27 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 2244 |
| Same as above plus superheater percentage | 2244 |
| Same as above but substitute firebox area for grate area | 8500 |
| Power L1 | 3483 |
| Power MT | 578.80 |