Richmond, Fredericksburg & Potomac 4-4-0 "American" Locomotives of the USA

Class Details by Steve Llanso of Sweat House Media

Class 16 (Locobase 11816)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Volume 11, p. 239. See also RF&P 1908 Locomotive Diagrams supplied in August 2013 by Allen Stanley from his extensive Raildata collection. Works numbers were 7007-7008 in October 1883.

A pair of relatively small, relatively low-drivered Eight-wheelers gave good service to the RF & P. The 51 (ex-16) remained on the books until 1913, when it was sold to the Detroit, Toledo & Ironton as their #10 and ran another 7 years. The 14 left in 1905 for the Bellefonte Central, another Ohio road, and took number 8. The BC sold it in 1912.

Class 20 (Locobase 11589)

Data from Baldwin Locomotive Works Specification for Engines, 1888, as digitized by the DeGolyer Library of Southern Methodist University Vol 15, p. 32. Works number was 9871 in March 1889.

This single Eight-wheeler gained some cylinder volume by extending its stroke 2" past the usual for a 17" cylinder. Only a few 4-4-0s would adopt a similar measure, most of the rest increasing the cylinder diameter an inch or more.

Specifications by Steve Llanso of Sweat House Media
Locobase ID11816 11589
RailroadRichmond, Fredericksburg & Potomac (RF&P)Richmond, Fredericksburg & Potomac (RF&P)
Number in Class21
Road Numbers16, 11 /22, 14 / 5120
Number Built21
BuilderBurnham, Parry, Williams & CoBurnham, Parry, Williams & Co
Valve GearStephensonStephenson
Locomotive Length and Weight
Driver Wheelbase 8.25' 8.25'
Engine Wheelbase22.17'22.17'
Ratio of driving wheelbase to overall engine wheebase 0.37 0.37
Overall Wheelbase (engine & tender)
Axle Loading (Maximum Weight per Axle)29730 lbs
Weight on Drivers48000 lbs54870 lbs
Engine Weight73000 lbs88750 lbs
Tender Light Weight
Total Engine and Tender Weight
Tender Water Capacity2400 gals2400 gals
Tender Fuel Capacity (oil/coal)
Minimum weight of rail (calculated)40 lb/yard46 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter61"66"
Boiler Pressure130 psi150 psi
Cylinders (dia x stroke)17" x 24"17" x 26"
Tractive Effort12564 lbs14516 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.82 3.78
Heating Ability
Firebox Area121 sq. ft121 sq. ft
Grate Area16.50 sq. ft16.50 sq. ft
Evaporative Heating Surface1183 sq. ft1183 sq. ft
Superheating Surface
Combined Heating Surface1183 sq. ft1183 sq. ft
Evaporative Heating Surface/Cylinder Volume187.63173.20
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation21452475
Same as above plus superheater percentage21452475
Same as above but substitute firebox area for grate area1573018150
Power L137484319
Power MT344.29347.07


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