Virtually identical to the Colorado & Southern's B-4Ps, but had smaller cylinder diameters and weighed slightly less. Gradually left service over a 26-year period from 1934 to 1960.
At least 5 were superheated (with a slight drop in boiler pressure from 205 psi) and fitted with 1" larger drivers; the data for that variant (taken from an April 1943 FW&D locomotive diagram) are used in the specs. The piston valves in this group measured 11" in diameter.
Fort Worth & Denver City began retiring this class in 1934, although the last B-4R1 lasted until 1960.
| Specifications | ||
|---|---|---|
| Class | B-4O | B-4R |
| Locobase ID | 1336 | 1338 |
| Railroad | Fort Worth & Denver City | Fort Worth & Denver City |
| Whyte | 2-8-0 | 2-8-0 |
| Road Numbers | 201-211 | 300-314 |
| Gauge | Std | Std |
| Builder | Rhode Island | several |
| Year | 1903 | 1906 |
| Valve Gear | Walschaert | Stephenson |
| Locomotive Length and Weight | ||
| Driver Wheelbase | 15.50' | 15.33' |
| Engine Wheelbase | 24.17' | 23.67' |
| Ratio of driving wheelbase to overall engine wheebase | 0.64 | 0.65 |
| Overall Wheelbase (engine & tender) | 56.58' | 57.50' |
| Axle Loading (Maximum Weight per Axle) | ||
| Weight on Drivers | 142000 lbs | 180795 lbs |
| Engine Weight | 158000 lbs | 200854 lbs |
| Tender Light Weight | 133250 lbs | 145500 lbs |
| Total Engine and Tender Weight | 291250 lbs | 346354 lbs |
| Tender Water Capacity | 6000 gals | 8000 gals |
| Tender Fuel Capacity (oil/coal) | 4100 gals | 2600 gals |
| Minimum weight per yard of rail on which locomotive could run | 59.17 lb rail | 75.33 lb rail |
| Geometry Relating to Tractive Effort | ||
| Driver Diameter | 56" | 57" |
| Boiler Pressure | 188.50 psi | 200 psi |
| Cylinders (dia x stroke) | 20" x 28" | 22" x 28" |
| Tractive Effort | 32045 lbs | 40418 lbs |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.43 | 4.47 |
| Heating Ability | ||
| Firebox Area | 187.70 sq. ft | 195 sq. ft |
| Grate Area | 41.30 sq. ft | 34.65 sq. ft |
| Evaporative Heating Surface | 1999 | 2393 |
| Superheating Surface | 508 | |
| Combined Heating Surface | 1999 | 2901 |
| Evaporative Heating Surface/Cylinder Volume | 196.34 | 194.25 |
| Computations Relating to Power Output (More Information) | ||
| Robert LeMassena's Power Computation | 7785.05 | 6930 |
| Same as above plus superheater percentage | 7785.05 | 8143.53 |
| Same as above but substitute firebox area for grate area | 35381.45 | 45829.37 |
| Power L1 | 5076.12 | 12246.01 |
| Power MT | 315.24 | 597.31 |
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