Data from DeGolyer, Volume 35, p. 19. Works numbers for C&S 350-354 were 35771-35773, 35796-3797 in December 1910; those for the FW&DC 501-505 were 35798 in December 1910 and 35854-35857 in January 1911.
Four years after the last Baldwin Ten-wheeler, the C&S and FW&DC took delivery of these much bigger Pacifics from Baldwin as a single batch. Drury (1993) says they were copies of the CB & Q's S-2 class (see Locobase 9384). All had 12" (305 mm) piston valves and Emerson superheaters (24 flues and a superheater surface area of 845 sq ft). Emerson superheater tubes had thicker walls (BWG #9)
In 1923, the C&S made over the boiler while installing a 32-tube Schmidt superheater (see Locobase 6757) while the FW&DC updated the 501-505 (see Locobase 9853).
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | F-3-A |
| Locobase ID | 16212 |
| Railroad | Fort Worth & Denver City, Colorado & Southern |
| Country | USA |
| Whyte | 4-6-2 |
| Number in Class | 10 |
| Road Numbers | 501-505, 350-354 |
| Gauge | Std |
| Number Built | 10 |
| Builder | Baldwin |
| Year | 1910 |
| Valve Gear | Walschaert |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 12.83 / 3.91 |
| Engine Wheelbase (ft / m) | 32.75 / 9.98 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.39 |
| Overall Wheelbase (engine & tender) (ft / m) | 64.29 / 19.60 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
| Weight on Drivers (lbs / kg) | 150,000 / 68,039 |
| Engine Weight (lbs / kg) | 230,000 / 104,326 |
| Tender Loaded Weight (lbs / kg) | 160,300 / 72,711 |
| Total Engine and Tender Weight (lbs / kg) | 390,300 / 177,037 |
| Tender Water Capacity (gals / ML) | 8200 / 31.06 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 13 / 12 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 83 / 41.50 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 69 / 1753 |
| Boiler Pressure (psi / kPa) | 160 / 1100 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 25" x 28" / 635x711 |
| Tractive Effort (lbs / kg) | 34,493 / 15645.78 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.35 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 170 - 2.25" / 57 |
| Flues (number - dia) (in / mm) | 24 - 5.5" / 140 |
| Flue/Tube length (ft / m) | 21 / 6.40 |
| Firebox Area (sq ft / m2) | 194 / 18.02 |
| Grate Area (sq ft / m2) | 55 / 5.11 |
| Evaporative Heating Surface (sq ft / m2) | 3010 / 279.64 |
| Superheating Surface (sq ft / m2) | 845 / 78.50 |
| Combined Heating Surface (sq ft / m2) | 3855 / 358.14 |
| Evaporative Heating Surface/Cylinder Volume | 189.19 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 8800 |
| Same as above plus superheater percentage | 10,736 |
| Same as above but substitute firebox area for grate area | 37,869 |
| Power L1 | 13,398 |
| Power MT | 590.75 |