Fort Worth & Denver City, Colorado & Southern 4-6-2 "Pacific" Locomotives of the USA

Class Details by Steve Llanso of Sweat House Media

Class F-3-A (Locobase 16212)

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).

Specifications by Steve Llanso of Sweat House Media
Locobase ID16212
RailroadFort Worth & Denver City, Colorado & Southern
Number in Class10
Road Numbers501-505, 350-354
Number Built10
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase12.83'
Engine Wheelbase32.75'
Ratio of driving wheelbase to overall engine wheebase 0.39
Overall Wheelbase (engine & tender)64.29'
Axle Loading (Maximum Weight per Axle)
Weight on Drivers150000 lbs
Engine Weight230000 lbs
Tender Light Weight160300 lbs
Total Engine and Tender Weight390300 lbs
Tender Water Capacity8200 gals
Tender Fuel Capacity (oil/coal)13 tons
Minimum weight of rail (calculated)83 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter69"
Boiler Pressure160 psi
Cylinders (dia x stroke)25" x 28"
Tractive Effort34493 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.35
Heating Ability
Firebox Area194 sq. ft
Grate Area55 sq. ft
Evaporative Heating Surface3010 sq. ft
Superheating Surface845 sq. ft
Combined Heating Surface3855 sq. ft
Evaporative Heating Surface/Cylinder Volume189.21
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation8800
Same as above plus superheater percentage10736
Same as above but substitute firebox area for grate area37869
Power L113400
Power MT590.84

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