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

Class Details by Steve Llanso of Sweat House Media

Class 2 (Locobase 10789)

Data from Baldwin Locomotive Works, Record of Recent Construction ((1903), No. 39, p.280-281. Works number was 20919.

This 38-mile narrow-gauge line connected Fredericksburg and Orange in northern Virginia's Spotsylvania County. Established before the Civil War, the P F & P maintained its narrow-gauge right-of-way until 1926. This little American moved to the Orange & Fredericksburg when the original railroad widened its gauge. A year later the O & F sold the engine to the Virginia Central in November 1927.

Specifications by Steve Llanso of Sweat House Media
Locobase ID10789
RailroadPotomac, Fredericksburg & Piedmont
Number in Class1
Road Numbers2
Number Built1
BuilderBurnham, Williams & Co
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase 8.17'
Engine Wheelbase21.67'
Ratio of driving wheelbase to overall engine wheebase 0.38
Overall Wheelbase (engine & tender)40.58'
Axle Loading (Maximum Weight per Axle)
Weight on Drivers36540 lbs
Engine Weight57500 lbs
Tender Light Weight27500 lbs
Total Engine and Tender Weight85000 lbs
Tender Water Capacity1400 gals
Tender Fuel Capacity (oil/coal)
Minimum weight of rail (calculated)30 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter44"
Boiler Pressure150 psi
Cylinders (dia x stroke)13" x 18"
Tractive Effort8815 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.15
Heating Ability
Firebox Area70.20 sq. ft
Grate Area10 sq. ft
Evaporative Heating Surface803 sq. ft
Superheating Surface
Combined Heating Surface803 sq. ft
Evaporative Heating Surface/Cylinder Volume290.39
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation1500
Same as above plus superheater percentage1500
Same as above but substitute firebox area for grate area10530
Power L14591
Power MT553.99

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