Note that the superheater area in the specs is estimated. It is a calculation based on taking the diagram value of 2,120 sq ft of "superheater equivalent" and deducting a third from it. See the logic presented in Locobase 1364.
| Specifications | |
|---|---|
| Class | O-20 |
| Locobase ID | 278 |
| Railroad | Minneapolis, St Paul & Sault Ste Marie (Soo) |
| Whyte | 4-8-4 |
| Road Numbers | 5000-5003 |
| Gauge | Std |
| Builder | Lima |
| Year | 1938 |
| Valve Gear | Walschaert |
| Locomotive Length and Weight | |
| Driver Wheelbase | 19.75' |
| Engine Wheelbase | 46.75' |
| Ratio of driving wheelbase to overall engine wheebase | 0.42 |
| Overall Wheelbase (engine & tender) | 87.47' |
| Axle Loading (Maximum Weight per Axle) | 65900 lbs |
| Weight on Drivers | 263000 lbs |
| Engine Weight | 445550 lbs |
| Tender Light Weight | 317600 lbs |
| Total Engine and Tender Weight | 763150 lbs |
| Tender Water Capacity | 17500 gals |
| Tender Fuel Capacity (oil/coal) | 24 tons |
| Minimum weight per yard of rail on which locomotive could run | 109.58 lb rail |
| Geometry Relating to Tractive Effort | |
| Driver Diameter | 75" |
| Boiler Pressure | 275 psi |
| Cylinders (dia x stroke) | 26" x 32" |
| Tractive Effort | 67420 lbs |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 3.90 |
| Heating Ability | |
| Firebox Area | 423 sq. ft |
| Grate Area | 88.30 sq. ft |
| Evaporative Heating Surface | 5142 |
| Superheating Surface | 1413 |
| Combined Heating Surface | 6555 |
| Evaporative Heating Surface/Cylinder Volume | 261.49 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 24282.50 |
| Same as above plus superheater percentage | 29516.85 |
| Same as above but substitute firebox area for grate area | 141400.09 |
| Power L1 | 34916.84 |
| Power MT | 1170.77 |
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