Unspecified 0-4-4 "Forney" Locomotives of the USA

Class Details by Steve Llanso of Sweat House Media

Class Forney (Locobase 10023)

Data from Park Benjamin (Ed), Appleton's Cyclopedia of Applied Mechanics (New York: D Appleton & Company, 1884), p. 341. Boiler pressure is an estimate.

While no builder is identified as the manufacturer (and no railroad as its customer) of this locomotive, its size marks it as a relatively large engine of the Forney type.

Specifications by Steve Llanso of Sweat House Media
Locobase ID10,023
Number in Class
Road Numbers
Number Built
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft) 6.67
Engine Wheelbase (ft)20.75
Ratio of driving wheelbase to overall engine wheebase 0.32
Overall Wheelbase (engine & tender) (ft)
Axle Loading (Maximum Weight per Axle) (lbs)
Weight on Drivers (lbs)44,000
Engine Weight (lbs)60,000
Tender Loaded Weight (lbs)
Total Engine and Tender Weight (lbs)60,000
Tender Water Capacity (gals)1500
Tender Fuel Capacity (oil/coal) (gals/tons)
Minimum weight of rail (calculated) (lb/yd)37
Geometry Relating to Tractive Effort
Driver Diameter (in)50
Boiler Pressure (psi)140
High Pressure Cylinders (dia x stroke) (in)14" x 20"
Tractive Effort (lbs)9330
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.72
Heating Ability
Firebox Area (sq ft)78
Grate Area (sq ft)14
Evaporative Heating Surface (sq ft)812
Superheating Surface (sq ft)
Combined Heating Surface (sq ft)812
Evaporative Heating Surface/Cylinder Volume227.87
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation1960
Same as above plus superheater percentage1960
Same as above but substitute firebox area for grate area10,920
Power L13935
Power MT394.33

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