Delivered in pairs in 1924 & 1925 with boilers pressing 200 psi, but later increased to 225 psi. Firebox heating surface included 95 sq ft of syphons, 16 sq ft of arch tubes.
They lasted until 1950.
| Specifications | |
|---|---|
| Class | 501 |
| Locobase ID | 221 |
| Railroad | Richmond, Fredericksburg & Potomac |
| Whyte | 4-8-2 |
| Road Numbers | 501-504 |
| Gauge | Std |
| Builder | Alco-Richmond |
| Year | 1924 |
| Valve Gear | Walschaert |
| Locomotive Length and Weight | |
| Driver Wheelbase | 20' |
| Engine Wheelbase | 42.17' |
| Ratio of driving wheelbase to overall engine wheebase | 0.47 |
| Overall Wheelbase (engine & tender) | 81.75' |
| Axle Loading (Maximum Weight per Axle) | |
| Weight on Drivers | 262000 lbs |
| Engine Weight | 381000 lbs |
| Tender Light Weight | 201600 lbs |
| Total Engine and Tender Weight | 582600 lbs |
| Tender Water Capacity | 10000 gals |
| Tender Fuel Capacity (oil/coal) | 16 tons |
| Minimum weight per yard of rail on which locomotive could run | 109.17 lb rail |
| Geometry Relating to Tractive Effort | |
| Driver Diameter | 73" |
| Boiler Pressure | 225 psi |
| Cylinders (dia x stroke) | 28" x 30" |
| Tractive Effort | 61619 lbs |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.25 |
| Heating Ability | |
| Firebox Area | 465 sq. ft |
| Grate Area | 75 sq. ft |
| Evaporative Heating Surface | 4762 |
| Superheating Surface | 1190 |
| Combined Heating Surface | 5952 |
| Evaporative Heating Surface/Cylinder Volume | 222.73 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 16875 |
| Same as above plus superheater percentage | 20248.87 |
| Same as above but substitute firebox area for grate area | 125542.97 |
| Power L1 | 22787.02 |
| Power MT | 766.97 |
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