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 ID10023
Number in Class
Road Numbers
Number Built
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase 6.67'
Engine Wheelbase20.75'
Ratio of driving wheelbase to overall engine wheebase 0.32
Overall Wheelbase (engine & tender)
Axle Loading (Maximum Weight per Axle)
Weight on Drivers44000 lbs
Engine Weight60000 lbs
Tender Light Weight
Total Engine and Tender Weight60000 lbs
Tender Water Capacity1500 gals
Tender Fuel Capacity (oil/coal)
Minimum weight of rail (calculated)37 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter50"
Boiler Pressure140 psi
Cylinders (dia x stroke)14" x 20"
Tractive Effort9330 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.72
Heating Ability
Firebox Area78 sq. ft
Grate Area14 sq. ft
Evaporative Heating Surface812 sq. ft
Superheating Surface
Combined Heating Surface812 sq. ft
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 area10920
Power L13935
Power MT394.33

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