Polson Logging 2-6-2 "Prairie" Locomotives of the USA

Class Details by Steve Llanso of Sweat House Media

Class 45 (Locobase 12763)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Volume 28, p. 212. Works number was 27311 in January 1906.

Given the size difference between this wood-burning logging Prairie and the larger 2-8-0 delivered in the previous years (Locobase 12762), Locobase suspects this engine ventured deeper into the virgin forests west of Olympia that constituted Polson's arena. The specs hint at that possibility as well as they mention 25-degree curves and 4 1/2-6% (!) grades. The summary also notes "Engine will run forward up grade pulling the load and will run backward downgrade following the cars.", which explains the double-ender setup.

Even after the Rayonier Corporation took over Polson Logging more than 4 decades later in 1948, 45 continued to work. A photo of the 45 at this time shows an elaborate cylindrical spark arrester mounted on the slender stack.

In 1961, the RC donated 45 to the City of Hoquiam, which put it on display at Last Spur Park. In 1998, Mount Rainier Scenic Railroad bought the engine with intent to cosmetically restore it.

Specifications by Steve Llanso of Sweat House Media
Locobase ID12763
RailroadPolson Logging
Number in Class1
Road Numbers45
Number Built1
BuilderBurnham, Williams & Co
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase 9.17'
Engine Wheelbase23.75'
Ratio of driving wheelbase to overall engine wheebase 0.39
Overall Wheelbase (engine & tender)46.58'
Axle Loading (Maximum Weight per Axle)
Weight on Drivers66000 lbs
Engine Weight99000 lbs
Tender Light Weight50000 lbs
Total Engine and Tender Weight149000 lbs
Tender Water Capacity2500 gals
Tender Fuel Capacity (oil/coal)
Minimum weight of rail (calculated)37 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter44"
Boiler Pressure160 psi
Cylinders (dia x stroke)15" x 24"
Tractive Effort16691 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.95
Heating Ability
Firebox Area86 sq. ft
Grate Area14.13 sq. ft
Evaporative Heating Surface1074 sq. ft
Superheating Surface
Combined Heating Surface1074 sq. ft
Evaporative Heating Surface/Cylinder Volume218.79
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation2261
Same as above plus superheater percentage2261
Same as above but substitute firebox area for grate area13760
Power L13595
Power MT360.25

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