Potomac, Fredericksburg & Piedmont 4-4-0 "American" Locomotives in 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. See also DeGolyer, Volume 25, p. 19. Works number was 20919 in October 1902.

This 38-mile (61 km) narrow-gauge line connected Fredericksburg and Orange in northern Virginia's Spotsylvania County. Established before the Civil War, the PF&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.

Principal Dimensions by Steve Llanso of Sweat House Media
Locobase ID10,789
RailroadPotomac, Fredericksburg & Piedmont
Number in Class1
Road Numbers2
Number Built1
BuilderBurnham, Williams & Co
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m) 8.17 / 2.49
Engine Wheelbase (ft / m)21.67 / 6.61
Ratio of driving wheelbase to overall engine wheebase 0.38
Overall Wheelbase (engine & tender) (ft / m)40.58 / 12.37
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)36,540 / 16,574
Engine Weight (lbs / kg)57,500 / 26,082
Tender Loaded Weight (lbs / kg)27,500 / 12,474
Total Engine and Tender Weight (lbs / kg)85,000 / 38,556
Tender Water Capacity (gals / ML)1400 / 5.30
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)30 / 15
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)44 / 1118
Boiler Pressure (psi / kPa)150 / 10.30
High Pressure Cylinders (dia x stroke) (in / mm)13" x 18" / 330x457
Tractive Effort (lbs / kg)8815 / 3998.42
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.15
Heating Ability
Firebox Area (sq ft / m2)70.20 / 6.52
Grate Area (sq ft / m2)10 / 0.93
Evaporative Heating Surface (sq ft / m2)803 / 74.63
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)803 / 74.63
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 area10,530
Power L14591
Power MT553.99

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