John L Roper Lumber Company 2-6-2 "Prairie" Locomotives in 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.

Principal Dimensions by Steve Llanso of Sweat House Media
Class31
Locobase ID14,047
RailroadJohn L Roper Lumber Company
CountryUSA
Whyte2-6-2
Number in Class2
Road Numbers31-32
GaugeStd
Number Built2
BuilderBaldwin
Year1914
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m)8 / 2.44
Engine Wheelbase (ft / m)22.75 / 6.93
Ratio of driving wheelbase to overall engine wheebase 0.35
Overall Wheelbase (engine & tender) (ft / m)44.33 / 14.05
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)57,000 / 25,855
Engine Weight (lbs / kg)78,350 / 35,426
Tender Loaded Weight (lbs / kg)60,000 / 27,216
Total Engine and Tender Weight (lbs / kg)138,350 / 62,642
Tender Water Capacity (gals / ML)3000 / 11.36
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)6
Minimum weight of rail (calculated) (lb/yd / kg/m)32 / 16
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)44 / 1118
Boiler Pressure (psi / kPa)180 / 12.40
High Pressure Cylinders (dia x stroke) (in / mm)13" x 22" / 330x559
Tractive Effort (lbs / kg)12,929 / 5864.50
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.41
Heating Ability
Firebox Area (sq ft / m2)74 / 6.87
Grate Area (sq ft / m2)13.30 / 1.24
Evaporative Heating Surface (sq ft / m2)767 / 71.26
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)767 / 71.26
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 area13,320
Power L14441
Power MT515.30

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