Snoqualmie Falls Lumber Company 2-6-2 "Prairie" Locomotives in the USA

Class Details by Steve Llanso of Sweat House Media

Class 6 (Locobase 15238)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Vol 71, pp. 393+. Works numbers were 56323 in March 1923.

Somewhat larger than usual oil-burning Prairie saddle-tank logging engine that served the SFLC and successor Weyerhaeuser Timber until it was sold in 1948 to Canadian Forest Products as their #112. It remained in service into the 1960s before being put on display at Beaver Cove, British Columbia.

Principal Dimensions by Steve Llanso of Sweat House Media
Locobase ID15,238
RailroadSnoqualmie Falls Lumber Company
Number in Class2
Road Numbers6
Number Built2
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m)9 / 2.74
Engine Wheelbase (ft / m)24.42 / 7.44
Ratio of driving wheelbase to overall engine wheebase 0.37
Overall Wheelbase (engine & tender) (ft / m)24.42 / 7.44
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)115,000 / 52,163
Engine Weight (lbs / kg)153,000 / 69,400
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)153,000
Tender Water Capacity (gals / ML)2000 / 7.58
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)900 / 3.40
Minimum weight of rail (calculated) (lb/yd / kg/m)64 / 32
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)44 / 1118
Boiler Pressure (psi / kPa)175 / 12.10
High Pressure Cylinders (dia x stroke) (in / mm)18" x 24" / 457x610
Tractive Effort (lbs / kg)26,288 / 11924.05
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.37
Heating Ability
Firebox Area (sq ft / m2)109 / 10.13
Grate Area (sq ft / m2)22 / 2.04
Evaporative Heating Surface (sq ft / m2)1103 / 102.47
Superheating Surface (sq ft / m2)228 / 21.18
Combined Heating Surface (sq ft / m2)1331 / 123.65
Evaporative Heating Surface/Cylinder Volume156.04
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation3850
Same as above plus superheater percentage4505
Same as above but substitute firebox area for grate area22,318
Power L16718
Power MT386.36

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Wes Barris