Firebox had Security brick arch. When introduced, 5 were used in Minturn-Malta (Tennessee Pass), Colorado helper service and the other five ran through-freights between Denver and Salida (ruling grade 1.42%)
| Specifications | |
|---|---|
| Class | F-81 |
| Locobase ID | 429 |
| Railroad | Denver & Rio Grande Western (D&RGW) |
| Whyte | 2-10-2 |
| Road Numbers | 1400-1409 |
| Gauge | Std |
| Builder | Alco-Brooks |
| Year | 1917 |
| Valve Gear | Baker |
| Locomotive Length and Weight | |
| Driver Wheelbase | 22.50' |
| Engine Wheelbase | 41.42' |
| Ratio of driving wheelbase to overall engine wheebase | 0.54 |
| Overall Wheelbase (engine & tender) | 76.80' |
| Axle Loading (Maximum Weight per Axle) | 72100 lbs |
| Weight on Drivers | 337500 lbs |
| Engine Weight | 428500 lbs |
| Tender Light Weight | 286480 lbs |
| Total Engine and Tender Weight | 714980 lbs |
| Tender Water Capacity | 16000 gals |
| Tender Fuel Capacity (oil/coal) | 23 tons |
| Minimum weight per yard of rail on which locomotive could run | 113 lb rail |
| Geometry Relating to Tractive Effort | |
| Driver Diameter | 63" |
| Boiler Pressure | 195 psi |
| Cylinders (dia x stroke) | 31" x 32" |
| Tractive Effort | 80907 lbs |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.17 |
| Heating Ability | |
| Firebox Area | 368 sq. ft |
| Grate Area | 88 sq. ft |
| Evaporative Heating Surface | 5369 |
| Superheating Surface | 1329 |
| Combined Heating Surface | 6698 |
| Evaporative Heating Surface/Cylinder Volume | 192.06 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 17160 |
| Same as above plus superheater percentage | 20592 |
| Same as above but substitute firebox area for grate area | 86112 |
| Power L1 | 14041 |
| Power MT | 458.59 |
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