Fort Worth & Denver City 4-6-2 "Pacific" Locomotives in the USA


Class Details by Steve Llanso of Sweat House Media

Class F-3-A - rebuilt Schmidt sh (Locobase 9853)

Data from FW&DC 8 Locomotive Diagrams supplied in August 2013 by Allen Stanley from his extensive Rail Data Exchange.

Locobase 16212 shows the FW&DC 501-505 as they were when delivered with Emerson superheaters in 1910-1911. About a dozen years later, the railroad reorganized the boiler, removing the Emerson 24-tube configuration and deleting 13 tubes to make room for the 32 flues the newer superheater required. It was probably then that the railroad raised the working boiler pressure setting by 40 psi (2.76 bar) .

505 wrecked in December 1928 and scrapped a year later. 502-504 were scrapped in September 1952. 501 was donated to the City of Childress in May 1959.


Class F-3-A-1/F-3-A-2 (Locobase 9854)

Data from C & S 7 -1941 Locomotive Diagrams supplied in May 2005 by Allen Stanley from his extensive Rail Data Exchange. See also DeGolyer, Volume 67, pp. 37+. (Thanks to Chris Hohl for his 28 March 2016 email noting the original boiler pressure and tender oil capacity.) Alco supplied the first five (works numbers 61070-61072, 61416-61417 in January 1920); Baldwin added two more (55632-55633) that were completed in September 1922 and were identical save for increased weights.

These Pacifics were related to the S-3s (Locobase 1186) originally supplied to the Burlington Road in 1918, but were equipped with two more flues which yielded a bit more superheater area. (The Colorado & Southern bought three more that had 34 flues and smaller 69" drivers; see Locobase 6758.) The fireboxes were identical and derived 59 sq ft (5.5 sq m) of their direct heating surface from a combustion chamber. Like the C & S engines, these had 14" (356 mm) piston valves.

When delivered, the F-3-A tenders carried 3,200 US gallons (12,112 litres) of fuel oil. Their boilers were set at 180 psi (12.4 bar), but soon reset to 200 psi.

Specifications by Steve Llanso of Sweat House Media
ClassF-3-A - rebuilt Schmidt shF-3-A-1/F-3-A-2
Locobase ID9853 9854
RailroadFort Worth & Denver CityFort Worth & Denver City
CountryUSAUSA
Whyte4-6-24-6-2
Number in Class57
Road Numbers501-505551-557
GaugeStdStd
Number Built7
BuilderC&Sseveral
Year19231920
Valve GearWalschaertWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m)12.83 / 3.9613 / 3.96
Engine Wheelbase (ft / m)32.75 / 9.9833.71 / 10.27
Ratio of driving wheelbase to overall engine wheebase 0.39 0.39
Overall Wheelbase (engine & tender) (ft / m)64.29 / 19.6068.29 / 20.81
Axle Loading (Maximum Weight per Axle) (lbs / kg)52,600 / 23,859
Weight on Drivers (lbs / kg)153,000 / 69,400176,375 / 80,002
Engine Weight (lbs / kg)236,000 / 107,048290,275 / 131,667
Tender Loaded Weight (lbs / kg)160,300 / 72,711172,030 / 78,032
Total Engine and Tender Weight (lbs / kg)396,300 / 179,759462,305 / 209,699
Tender Water Capacity (gals / ML)8200 / 31.068200 / 31.06
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)13 / 11.804000 / 15.20
Minimum weight of rail (calculated) (lb/yd)8598
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)69 / 175374 / 1880
Boiler Pressure (psi / kPa)200 / 13.80200 / 13.80
High Pressure Cylinders (dia x stroke) (in / mm)25" x 28" / 635x71127" x 28" / 686x711
Tractive Effort (lbs / kg)43,116 / 19557.1146,892 / 21269.88
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.55 3.76
Heating Ability
Firebox Area (sq ft / m2)227 / 21.10292 / 27.13
Grate Area (sq ft / m2)55 / 5.1158.70 / 5.45
Evaporative Heating Surface (sq ft / m2)3098 / 287.923416 / 317.35
Superheating Surface (sq ft / m2)775 / 72.03797 / 74.04
Combined Heating Surface (sq ft / m2)3873 / 359.954213 / 391.39
Evaporative Heating Surface/Cylinder Volume194.75184.10
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation11,00011,740
Same as above plus superheater percentage13,20013,971
Same as above but substitute firebox area for grate area54,48069,496
Power L116,20516,018
Power MT700.51600.66