John L Roper Lumber Company 2-6-0 "Mogul" Locomotives in the USA

Class Details by Steve Llanso of Sweat House Media

Class 25 (Locobase 13177)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Volume 31, p . See also Floyd W Mundy (of James H Oliphant & Co), The Earning Power of Railroads (New York: Moody's Magazine Book Department, 1912), p. 379. Works number was 31597 in August 1907.

In 1906, the Norfolk Southern Railroad reorganized its railroad holdings and took control of all Roper stocks and bonds. By 1910, Moody' verbal snapshot illustrates just how big this lumber processor had become: "This company owns ten mills with an annual capacity of 150,000,000 feet of timber, together with timber rights on lands (800,000 acres, of which 600,000 acres owned in fee) containing 3,000,000,000 feet of standing timber."

To move all of this harvest, the Roper Company had laid 150 miles (242 km) of fully equipped standard gauge logging railroads. Altogether, reported Moody's, "The value of the properties of the John L. Roper Lumber Co. has been estimated at an amount exceeding $10,000,000."

Principal Dimensions by Steve Llanso of Middle Run Media

Locobase ID13177
RailroadJohn L Roper Lumber Company
Number in Class1
Road Numbers25
Number Built1
BuilderBurnham, Williams & Co
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m)10 / 3.05
Engine Wheelbase (ft / m)17.25 / 5.26
Ratio of driving wheelbase to overall engine wheelbase 0.58
Overall Wheelbase (engine & tender) (ft / m)
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)71,000 / 32,205
Engine Weight (lbs / kg)80,500 / 36,514
Tender Loaded Weight (lbs / kg)50,000 / 22,680
Total Engine and Tender Weight (lbs / kg)130,500 / 59,194
Tender Water Capacity (gals / ML)2500 / 9.47
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)39 / 19.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)50 / 1270
Boiler Pressure (psi / kPa)185 / 12.80
High Pressure Cylinders (dia x stroke) (in / mm)14.5" x 24" / 368x610
Tractive Effort (lbs / kg)15,870 / 7198.52
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.47
Heating Ability
Tubes (number - dia) (in / mm)155 - 2" / 51
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m) 9.33 / 2.84
Firebox Area (sq ft / m2)47.80 / 4.44
Grate Area (sq ft / m2)13 / 1.21
Evaporative Heating Surface (sq ft / m2)798 / 74.16
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)798 / 74.16
Evaporative Heating Surface/Cylinder Volume173.86
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation2405
Same as above plus superheater percentage2405
Same as above but substitute firebox area for grate area8843
Power L13483
Power MT324.45

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