Western Washington Logging Company 2-6-2 "Prairie" Locomotives of the USA

Class Details by Steve Llanso of Sweat House Media

Class 3 (Locobase 13284)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Volume 32, p. 2. Works number was 33048 in November 1908.

This little tank was like many other Baldwin logging Prairie engines. It was smaller than most and burned wood. As with many such locomotives, the 3 was called on to tackle some steep (6%) grades and very tight, 35-degree curves.

WWLC of Shelton, Wash was established in Shelton in 1899. Eleven years later, the company was recast as Mud Bay Logging, now out of Olympia. Eventually, Mud Bay sold the locomotive to Guy F Atkinson Contracting of Wallace, Calif as their 2904.

2904 was finally scrapped in January 1949.

Specifications by Steve Llanso of Sweat House Media
Locobase ID13284
RailroadWestern Washington Logging Company
Number in Class1
Road Numbers3
Number Built1
BuilderBurnham, Williams & Co
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase9'
Engine Wheelbase24'
Ratio of driving wheelbase to overall engine wheebase 0.38
Overall Wheelbase (engine & tender)24'
Axle Loading (Maximum Weight per Axle)
Weight on Drivers63000 lbs
Engine Weight86000 lbs
Tender Light Weight
Total Engine and Tender Weight86000 lbs
Tender Water Capacity1000 gals
Tender Fuel Capacity (oil/coal)
Minimum weight of rail (calculated)35 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter44"
Boiler Pressure160 psi
Cylinders (dia x stroke)15" x 22"
Tractive Effort15300 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.12
Heating Ability
Firebox Area71.80 sq. ft
Grate Area12.80 sq. ft
Evaporative Heating Surface689 sq. ft
Superheating Surface
Combined Heating Surface689 sq. ft
Evaporative Heating Surface/Cylinder Volume153.12
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation2048
Same as above plus superheater percentage2048
Same as above but substitute firebox area for grate area11488
Power L12733
Power MT286.92

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