John L Roper Lumber Company 2-6-2 "Prairie" Locomotives of the USA

Class Details by Steve Llanso of Sweat House Media

Class 31 (Locobase 14047)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Volume 45, p. 40. Works numbers were 4124, 41292 in March 1914.

When the line was sold to the Norfolk Southern in 1920, 31 went to the Nocatee Crate Company and 32 was sold to New Holland Corporation.

Specifications by Steve Llanso of Sweat House Media
Locobase ID14047
RailroadJohn L Roper Lumber Company
Number in Class2
Road Numbers31-32
Number Built2
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase8'
Engine Wheelbase22.75'
Ratio of driving wheelbase to overall engine wheebase 0.35
Overall Wheelbase (engine & tender)44.33'
Axle Loading (Maximum Weight per Axle)
Weight on Drivers57000 lbs
Engine Weight78350 lbs
Tender Light Weight60000 lbs
Total Engine and Tender Weight138350 lbs
Tender Water Capacity3000 gals
Tender Fuel Capacity (oil/coal)6 tons
Minimum weight of rail (calculated)32 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter44"
Boiler Pressure180 psi
Cylinders (dia x stroke)13" x 22"
Tractive Effort12929 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.41
Heating Ability
Firebox Area74 sq. ft
Grate Area13.30 sq. ft
Evaporative Heating Surface767 sq. ft
Superheating Surface
Combined Heating Surface767 sq. ft
Evaporative Heating Surface/Cylinder Volume226.94
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation2394
Same as above plus superheater percentage2394
Same as above but substitute firebox area for grate area13320
Power L14441
Power MT515.30

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