Western Washington Logging Company 2-6-2 "Prairie" Locomotives in 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.

Principal Dimensions 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 Wheelbase (ft / m)9 / 2.74
Engine Wheelbase (ft / m)24 / 7.32
Ratio of driving wheelbase to overall engine wheelbase 0.38
Overall Wheelbase (engine & tender) (ft / m)24 / 7.32
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)63,000 / 28,576
Engine Weight (lbs / kg)86,000 / 39,009
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)86,000
Tender Water Capacity (gals / ML)1000 / 3.79
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)
Minimum weight of rail (calculated) (lb/yd / kg/m)35 / 17.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)44 / 1118
Boiler Pressure (psi / kPa)160 / 11
High Pressure Cylinders (dia x stroke) (in / mm)15" x 22" / 381x559
Tractive Effort (lbs / kg)15,300 / 6939.97
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.12
Heating Ability
Tubes (number - dia) (in / mm)95 - 2" / 51
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)12.50 / 3.81
Firebox Area (sq ft / m2)71.80 / 6.67
Grate Area (sq ft / m2)12.80 / 1.19
Evaporative Heating Surface (sq ft / m2)689 / 64.01
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)689 / 64.01
Evaporative Heating Surface/Cylinder Volume153.11
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 area11,488
Power L12733
Power MT286.92

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