Polson Logging 2-8-0 "Consolidation" Locomotives of the USA

Class Details by Steve Llanso of Sweat House Media

Class 99 (Locobase 12762)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Volume 27, p. 214. Works number was 25416 in March 1905.

Wood-burning Consolidation of average size for a light-rail, standard gauge operation like a lumber company. Polson Logging was based in Hoquiam, Washington State and operated the 99 until 1948, when another big timber company, Rayonier Corp took over the company.

RC scrapped the 99 in 1959.

Specifications by Steve Llanso of Sweat House Media
Locobase ID12762
RailroadPolson Logging
Number in Class1
Road Numbers99
Number Built1
BuilderBurnham, Williams & Co
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase14'
Engine Wheelbase21.50'
Ratio of driving wheelbase to overall engine wheebase 0.65
Overall Wheelbase (engine & tender)46.58'
Axle Loading (Maximum Weight per Axle)
Weight on Drivers120000 lbs
Engine Weight137000 lbs
Tender Light Weight80000 lbs
Total Engine and Tender Weight217000 lbs
Tender Water Capacity4000 gals
Tender Fuel Capacity (oil/coal)
Minimum weight of rail (calculated)50 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter50"
Boiler Pressure180 psi
Cylinders (dia x stroke)20" x 24"
Tractive Effort29376 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.08
Heating Ability
Firebox Area141 sq. ft
Grate Area29.80 sq. ft
Evaporative Heating Surface1688 sq. ft
Superheating Surface
Combined Heating Surface1688 sq. ft
Evaporative Heating Surface/Cylinder Volume193.43
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation5364
Same as above plus superheater percentage5364
Same as above but substitute firebox area for grate area25380
Power L14113
Power MT302.25

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