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 ID16,212
RailroadFort Worth & Denver City, Colorado & Southern
Number in Class10
Road Numbers501-505, 350-354
Number Built10
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft)12.83
Engine Wheelbase (ft)32.75
Ratio of driving wheelbase to overall engine wheebase 0.39
Overall Wheelbase (engine & tender) (ft)64.29
Axle Loading (Maximum Weight per Axle) (lbs)
Weight on Drivers (lbs)150,000
Engine Weight (lbs)230,000
Tender Loaded Weight (lbs)160,300
Total Engine and Tender Weight (lbs)390,300
Tender Water Capacity (gals)8200
Tender Fuel Capacity (oil/coal) (gals/tons)13
Minimum weight of rail (calculated) (lb/yd)83
Geometry Relating to Tractive Effort
Driver Diameter (in)69
Boiler Pressure (psi)160
High Pressure Cylinders (dia x stroke) (in)25" x 28"
Tractive Effort (lbs)34,493
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.35
Heating Ability
Firebox Area (sq ft)194
Grate Area (sq ft)55
Evaporative Heating Surface (sq ft)3010
Superheating Surface (sq ft)845
Combined Heating Surface (sq ft)3855
Evaporative Heating Surface/Cylinder Volume189.21
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation8800
Same as above plus superheater percentage10,736
Same as above but substitute firebox area for grate area37,869
Power L113,400
Power MT590.84

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