John L Roper Lumber Company 0-4-4 "Forney" Locomotives of the USA

Class Details by Steve Llanso of Sweat House Media

Class 5 (Locobase 13890)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Vol 40 p. 1. Works number was 37808 in June 1912.

Many US logging railroads were built on the standard gauge, albeit to very light standards. And this little oil-burning tank design was at home at any gauge.

Specifications by Steve Llanso of Sweat House Media
Locobase ID13,890
RailroadJohn L Roper Lumber Company
Number in Class1
Road Numbers5
Number Built1
BuilderBurnham, Williams & Co
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft)5
Engine Wheelbase (ft)14.50
Ratio of driving wheelbase to overall engine wheebase 0.34
Overall Wheelbase (engine & tender) (ft)14.50
Axle Loading (Maximum Weight per Axle) (lbs)
Weight on Drivers (lbs)24,000
Engine Weight (lbs)39,000
Tender Loaded Weight (lbs)
Total Engine and Tender Weight (lbs)39,000
Tender Water Capacity (gals)600
Tender Fuel Capacity (oil/coal) (gals/tons)300
Minimum weight of rail (calculated) (lb/yd)20
Geometry Relating to Tractive Effort
Driver Diameter (in)33
Boiler Pressure (psi)160
High Pressure Cylinders (dia x stroke) (in)9" x 14"
Tractive Effort (lbs)4673
Factor of Adhesion (Weight on Drivers/Tractive Effort) 5.14
Heating Ability
Firebox Area (sq ft)34
Grate Area (sq ft) 8.10
Evaporative Heating Surface (sq ft)230
Superheating Surface (sq ft)
Combined Heating Surface (sq ft)230
Evaporative Heating Surface/Cylinder Volume223.12
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation1296
Same as above plus superheater percentage1296
Same as above but substitute firebox area for grate area5440
Power L13415
Power MT627.40

If you have any railroad data such as diagram books, rail station plans or anything else that you would be willing to share, please contact us.