Wynooche Timber Company 2-6-2 "Prairie" Locomotives of the USA

Class Details by Steve Llanso of Sweat House Media

Class 3 (Locobase 15244)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Vol 71, pp. 432+. Works numbers was 57212 in September 1923.

Not long after the 4 arrived as a saturated-boiler logging Prairie saddle tank, this superheated version joined the WTC. According to Gene Connelly's Baldwin production list, the 3 was originally intended for the West End Coal Company as their 41, then diverted to the WTC. Like the 4, the 3 was renumbered when the Schafer Brothers Lumber Company bought the WTC in 1928 as the 9 and later renumbered 29.

Class 4 (Locobase 15243)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Volume 71, p. 428+. Works number was 55913 in December 1922.

The WTC was based in Hoquiam, Wash and exploited timber reserves along the Wynooche River. This typical oil-burning logging Prairie saddle tank rolled along a typical logging road that featured 6-7% grades and ultra-tight 40 degrees. The 4 spent only a short time wearing the WTC's herald before the company was sold to Shafer Brothers Logging Company. When the latter took over, they renumbered the 4 as their #8. It was later renumbered 28 and remained in service into the 1950s.

Specifications by Steve Llanso of Sweat House Media
Locobase ID15244 15243
RailroadWynooche Timber CompanyWynooche Timber Company
Number in Class11
Road Numbers34
Number Built11
Valve GearWalschaertStephenson
Locomotive Length and Weight
Driver Wheelbase9'10'
Engine Wheelbase24.42'25.75'
Ratio of driving wheelbase to overall engine wheebase 0.37 0.39
Overall Wheelbase (engine & tender)24.42'25.75'
Axle Loading (Maximum Weight per Axle)
Weight on Drivers115500 lbs96000 lbs
Engine Weight154000 lbs123000 lbs
Tender Light Weight
Total Engine and Tender Weight154000 lbs123000 lbs
Tender Water Capacity2500 gals1600 gals
Tender Fuel Capacity (oil/coal)900 gals600 gals
Minimum weight of rail (calculated)64 lb/yard53 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter44"44"
Boiler Pressure175 psi165 psi
Cylinders (dia x stroke)18" x 24"17" x 24"
Tractive Effort26288 lbs22109 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.39 4.34
Heating Ability
Firebox Area109 sq. ft80 sq. ft
Grate Area22 sq. ft14.40 sq. ft
Evaporative Heating Surface1103 sq. ft1151 sq. ft
Superheating Surface228 sq. ft
Combined Heating Surface1331 sq. ft1151 sq. ft
Evaporative Heating Surface/Cylinder Volume156.04182.55
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation38502376
Same as above plus superheater percentage45052376
Same as above but substitute firebox area for grate area2231813200
Power L167182977
Power MT384.69205.10

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