The diagram is less informative about heating surfaces, giving only the total of evaporative and superheater combined as 8,332 sq ft. This is 737 sq ft more than the USRA standard.
| Specifications | |
|---|---|
| Class | 20 |
| Locobase ID | 6441 |
| Railroad | Interstate |
| Whyte | 2-8-8-2 |
| Road Numbers | 20-21 |
| Gauge | Std |
| Builder | Alco-Brooks |
| Year | 1925 |
| Valve Gear | Walschaert |
| Locomotive Length and Weight | |
| Driver Wheelbase | 15.75' |
| Engine Wheelbase | 58' |
| Ratio of driving wheelbase to overall engine wheebase | 0.27 |
| Overall Wheelbase (engine & tender) | 94.25' |
| Axle Loading (Maximum Weight per Axle) | 62000 lbs |
| Weight on Drivers | 486500 lbs |
| Engine Weight | 541000 lbs |
| Tender Light Weight | 209200 lbs |
| Total Engine and Tender Weight | 750200 lbs |
| Tender Water Capacity | 12000 gals |
| Tender Fuel Capacity (oil/coal) | 16 tons |
| Minimum weight per yard of rail on which locomotive could run | 101.35 lb rail |
| Geometry Relating to Tractive Effort | |
| Driver Diameter | 57" |
| Boiler Pressure | 240 psi |
| Cylinders (dia x stroke) | 25" x 32" |
| Low Pressure Cylinders (dia x stroke) | 39" x 32" |
| Tractive Effort | 101465 lbs |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.79 |
| Heating Ability | |
| Firebox Area | |
| Grate Area | 96.50 sq. ft |
| Evaporative Heating Surface | |
| Superheating Surface | |
| Combined Heating Surface | 0 |
| Evaporative Heating Surface/Cylinder Volume | |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 23160 |
| Same as above plus superheater percentage | 23160 |
| Same as above but substitute firebox area for grate area | 0 |
| Power L1 | 0 |
| Power MT | 0 |
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