Locobase 6757 shows the Colorado & Southern F-3-As. The FW & DC 501-505 were identical and had works #35798 (December 1910) and 35854-35856 (January 1911). Firebox heating surface included 33 sq ft of arch tubes, but the firebox heating surface measured slightly lower than the C & S engines.
Although appparently given the same designation as the C & S F-3-Bs of 1919 (Locobase 9385) and related to the S-3s (Locobase 1186) originally supplied to the Burlington Road in 1918, this FW & DC class had 2 more flues which yielded a bit more superheater area. The fireboxes were identical and derived 59 sq ft of their direct heating surface from a combustion chamber.
Alco supplied the first five (works 61070-61072, 61416-61417), which arrived in 1920; Baldwin added 2 more (55632-55633) that were completed in September 1922 and were identical save for increased weights.
| Specifications | ||
|---|---|---|
| Class | F-3-A | F-3-A-1/F-3-A-2 |
| Locobase ID | 9853 | 9854 |
| Railroad | Fort Worth & Denver City | Fort Worth & Denver City |
| Whyte | 4-6-2 | 4-6-2 |
| Road Numbers | 501-505 | 551-557 |
| Gauge | Std | Std |
| Builder | Baldwin | several |
| Year | 1910 | 1920 |
| Valve Gear | Walschaert | Walschaert |
| Locomotive Length and Weight | ||
| Driver Wheelbase | 13' | 13' |
| Engine Wheelbase | 32.75' | 33.71' |
| Ratio of driving wheelbase to overall engine wheebase | 0.40 | 0.39 |
| Overall Wheelbase (engine & tender) | 64.29' | 68.29' |
| Axle Loading (Maximum Weight per Axle) | 52600 lbs | |
| Weight on Drivers | 153000 lbs | 176375 lbs |
| Engine Weight | 236000 lbs | 290275 lbs |
| Tender Light Weight | 160300 lbs | 172030 lbs |
| Total Engine and Tender Weight | 396300 lbs | 462305 lbs |
| Tender Water Capacity | 8200 gals | 8200 gals |
| Tender Fuel Capacity (oil/coal) | 13 tons | 4000 gals |
| Minimum weight per yard of rail on which locomotive could run | 85 lb rail | 97.99 lb rail |
| Geometry Relating to Tractive Effort | ||
| Driver Diameter | 69" | 74" |
| Boiler Pressure | 200 psi | 200 psi |
| Cylinders (dia x stroke) | 25" x 28" | 27" x 28" |
| Tractive Effort | 43116 lbs | 46892 lbs |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 3.55 | 3.76 |
| Heating Ability | ||
| Firebox Area | 227 sq. ft | 292 sq. ft |
| Grate Area | 55 sq. ft | 58.70 sq. ft |
| Evaporative Heating Surface | 3098 | 3416 |
| Superheating Surface | 775 | 797 |
| Combined Heating Surface | 3873 | 4213 |
| Evaporative Heating Surface/Cylinder Volume | 194.75 | 184.10 |
| Computations Relating to Power Output (More Information) | ||
| Robert LeMassena's Power Computation | 11000 | 11740 |
| Same as above plus superheater percentage | 13201.14 | 13960.93 |
| Same as above but substitute firebox area for grate area | 54484.69 | 69447.90 |
| Power L1 | 16204.73 | 16017.69 |
| Power MT | 700.50 | 600.64 |
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