Cascade Timber Company 2-6-2 "Prairie" Locomotives of the USA

Class Details by Steve Llanso of Sweat House Media

Class 107 (Locobase 15232)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Volume 71, pp. 336+. See also "Baldwin 'Prairie' 2-6-2", Orange Empire Railway Museum website at, last accessed 4 June 2013. Works number was 55415 in May 1922.

Among the holdings of the Pacific States Lumber Company of Tacoma, Wash was the Cascade Timber Company of North Yakima. It was founded in 1902 and operated independently until 1957, when it merged with Boise-Payette to form Boise-Cascade.

A coal-burning saddle-tank logging Prairie locomotive was in the minority of such engines in the Pacific Northwest-most were oil-burners. But otherwise the superheated 107 fell right into line on moderate curves of 16 to 20 degrees and up short grades of 3% and a half-mile (0.8 km) grade of 2 1/2%. The hotter steam meant 8" (203 mm) piston valves.

The 107 operated for Cascade Timber until it was sold $16,865 in 1942 to Ventura County Railway in Oxnard, Calif as their #2. 21 years later, the 2 wsa sold to W E Standish of Port Hueneme, Calif in February 1964. Sold again in 1970 to Terry Durkin for his Orange Empire Trolley (later Railway) Museum, where it went on display in November 1973, then into tourist railroad service. The 2 was extensively overhauled from 2001-2006, then placed back in operation.

Specifications by Steve Llanso of Sweat House Media
Locobase ID15,232
RailroadCascade Timber Company
Number in Class2
Road Numbers107
Number Built2
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft)11
Engine Wheelbase (ft)26.58
Ratio of driving wheelbase to overall engine wheebase 0.41
Overall Wheelbase (engine & tender) (ft)48.54
Axle Loading (Maximum Weight per Axle) (lbs)
Weight on Drivers (lbs)108,000
Engine Weight (lbs)137,000
Tender Loaded Weight (lbs)60,000
Total Engine and Tender Weight (lbs)197,000
Tender Water Capacity (gals)3000
Tender Fuel Capacity (oil/coal) (gals/tons)7
Minimum weight of rail (calculated) (lb/yd)60
Geometry Relating to Tractive Effort
Driver Diameter (in)44
Boiler Pressure (psi)180
High Pressure Cylinders (dia x stroke) (in)18" x 24"
Tractive Effort (lbs)27,039
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.99
Heating Ability
Firebox Area (sq ft)150
Grate Area (sq ft)26.20
Evaporative Heating Surface (sq ft)1456
Superheating Surface (sq ft)332
Combined Heating Surface (sq ft)1788
Evaporative Heating Surface/Cylinder Volume205.98
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation4716
Same as above plus superheater percentage5612
Same as above but substitute firebox area for grate area32,130
Power L19699
Power MT593.96

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