Columbia River Belt Line 2-6-2 "Prairie" Locomotives of the USA

Class Details by Steve Llanso of Sweat House Media

Class Siwash (Locobase 11059)

Data from "Oil-Burning Locomotives", Record of Recent Construction #57 (Baldwin Locomotive Works, 1911), p. 7. See also DeGolyer, Volume 39, p. 27. Works number was 36570 was in May 1911.

This logger operated in Oregon, first for the CRBL - headquartered in Blind Slough, Ore --, then for Larkins Green Lumber Company. Baldwin's specs required the engine to scale 8% grades, negotiate 50-deg curves on relatively robust 60-lb/yard (30-kg/metre) rails. The tight curvatures meant that both trucks were allowed a generous 6 1/4 inches of traverse to each side.

Specifications by Steve Llanso of Sweat House Media
Locobase ID11059
RailroadColumbia River Belt Line
Number in Class1
Road Numbers
Number Built1
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase9'
Engine Wheelbase23.50'
Ratio of driving wheelbase to overall engine wheebase 0.38
Overall Wheelbase (engine & tender)23.50'
Axle Loading (Maximum Weight per Axle)
Weight on Drivers85400 lbs
Engine Weight119600 lbs
Tender Light Weight
Total Engine and Tender Weight119600 lbs
Tender Water Capacity1200 gals
Tender Fuel Capacity (oil/coal)450 gals
Minimum weight of rail (calculated)47 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter44"
Boiler Pressure165 psi
Cylinders (dia x stroke)17" x 22"
Tractive Effort20266 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.21
Heating Ability
Firebox Area93 sq. ft
Grate Area14.40 sq. ft
Evaporative Heating Surface1282 sq. ft
Superheating Surface
Combined Heating Surface1282 sq. ft
Evaporative Heating Surface/Cylinder Volume221.82
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation2376
Same as above plus superheater percentage2376
Same as above but substitute firebox area for grate area15345
Power L13657
Power MT283.22

If you have any railroad data such as diagram books, rail station plans or anything else that you would be willing to share, please contact us.