Wind River Lumber Company 2-6-2 "Prairie" Locomotives in the USA

Class Details by Steve Llanso of Sweat House Media

Class 2 (Locobase 14976)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Volume 65, pp. 336+. Works number was 53341 in June 1920.

This Oregon timber harvester operated in the Wind River Valley (go figure) and used locomotives like this logging Prairie tank to haul the fallen trees to the mill. The tram roads over which the 2 traveled was laid with 35-40 lb/yard (17.5-20 kg). Maximum grades soared to 5% and curves bent as tightly as 25 degrees (radii of 231 feet/70.4 metres). A "Hereafter" note suggested "Raising question about making cylinder 13 1/2" diameter and working pressure 175 pounds as originally specified." According to another note in the specs, the company shrugged, accepted the 14" cylinders, and asked the builder to set the safety valves at 165 pounds.

The 2 would later be sold to Spaulding Pulp & Paper Company.

Principal Dimensions by Steve Llanso of Sweat House Media
Locobase ID14,976
RailroadWind River Lumber Company
Number in Class1
Road Numbers2
Number Built1
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m) 9.50 / 2.90
Engine Wheelbase (ft / m)21.92 / 6.68
Ratio of driving wheelbase to overall engine wheebase 0.43
Overall Wheelbase (engine & tender) (ft / m)21.92 / 6.68
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)60,000 / 27,216
Engine Weight (lbs / kg)84,000 / 38,102
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)84,000
Tender Water Capacity (gals / ML)1000 / 3.79
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)33 / 16.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)37 / 940
Boiler Pressure (psi / kPa)165 / 11.40
High Pressure Cylinders (dia x stroke) (in / mm)14" x 18" / 356x457
Tractive Effort (lbs / kg)13,373 / 6065.90
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.49
Heating Ability
Firebox Area (sq ft / m2)71 / 6.60
Grate Area (sq ft / m2)12.30 / 1.14
Evaporative Heating Surface (sq ft / m2)654 / 60.76
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)654 / 60.76
Evaporative Heating Surface/Cylinder Volume203.93
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation2030
Same as above plus superheater percentage2030
Same as above but substitute firebox area for grate area11,715
Power L13201
Power MT352.85

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