Firebox had 200 sq ft of heating surface in three thermic syphons and arch tubes as well as 206 sq ft in the combustion chamber. This second group of five engines had smaller heating surfaces and consequently different ratios.
A third group of six (3800-3805) L-97s were leased from the UP during World War II. They were returned to the UP, which then sold them to the Clinchfield in 1947. See the UP Challenger entry.
Firebox had 200 sq ft of heating surface in three thermic syphons and arch tubes. These were built for dual-service operation over the Continental Divide.
| Specifications | ||
|---|---|---|
| Class | L-105 | L-105 |
| Locobase ID | 1345 | 339 |
| Railroad | Denver & Rio Grande Western (D&RGW) | Denver & Rio Grande Western (D&RGW) |
| Whyte | 4-6-6-4 | 4-6-6-4 |
| Road Numbers | 3710-3714 | 3700-3709 |
| Gauge | Std | Std |
| Builder | Baldwin | Baldwin |
| Year | 1938 | 1938 |
| Valve Gear | Walschaert | Walschaert |
| Locomotive Length and Weight | ||
| Driver Wheelbase | 12.17' | 12.17' |
| Engine Wheelbase | 61.50' | 61.50' |
| Ratio of driving wheelbase to overall engine wheebase | 0.20 | 0.20 |
| Overall Wheelbase (engine & tender) | ||
| Axle Loading (Maximum Weight per Axle) | 74721 lbs | 73669 lbs |
| Weight on Drivers | 435472 lbs | 437939 lbs |
| Engine Weight | 641700 lbs | 641900 lbs |
| Tender Light Weight | 393630 lbs | 394000 lbs |
| Total Engine and Tender Weight | 1035330 lbs | 1035900 lbs |
| Tender Water Capacity | 20000 gals | 20000 gals |
| Tender Fuel Capacity (oil/coal) | 26 tons | 26 tons |
| Minimum weight per yard of rail on which locomotive could run | 120.96 lb rail | 121.65 lb rail |
| Geometry Relating to Tractive Effort | ||
| Driver Diameter | 70" | 70" |
| Boiler Pressure | 255 psi | 255 psi |
| Cylinders (dia x stroke) | 23" x 32" (4) | 23" x 32" (4) |
| Tractive Effort | 104833 lbs | 104833 lbs |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.15 | 4.18 |
| Heating Ability | ||
| Firebox Area | 806 sq. ft | 806 sq. ft |
| Grate Area | 136.50 sq. ft | 136.50 sq. ft |
| Evaporative Heating Surface | 5730 | 6341 |
| Superheating Surface | 2525 | 2628 |
| Combined Heating Surface | 8255 | 8969 |
| Evaporative Heating Surface/Cylinder Volume | 186.18 | 206.04 |
| Computations Relating to Power Output (More Information) | ||
| Robert LeMassena's Power Computation | 34807.50 | 34807.50 |
| Same as above plus superheater percentage | 45454.25 | 45006.42 |
| Same as above but substitute firebox area for grate area | 268396.54 | 265752.19 |
| Power L1 | 31402.05 | 32888.78 |
| Power MT | 953.86 | 993.39 |
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