W B Harbeson Lumber Company 2-6-2 "Prairie" Locomotives of the USA

Class Details by Steve Llanso of Sweat House Media

Class 100 (Locobase 14262)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Volume 52, p. 278+. (Many thanks to Chris Hohl's 4 August 2015 email providing the tender's wood capacity and his comments on Harbeson company numbers prompted a review of several entries.) Works numbers were 41920 in February 1915, 42703 in December, and 42782 in January 1916

Almost immediately after the 2-4-2ST shown in Locobase 14261 was delivered to Harbison at De Funiak Springs, Fla as their engine #100, they took delivery of the wood-burning, tender-pulling logging Prairies shown here. Their tenders carried 3 cords of wood. There was no 101.

NB: DeFuniak Springs was named for Colonel Fred DeFuniak, an official of the Louisville & Nashville Railroad.

Class 104 (Locobase 14268)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Volume 73, p. 387+. Works numbers were 58680 in September 1925.

Locobase 14267 describes the first two superheated, coal-burning logging Prairies delivered to DeFuniak Springs, Fla in 1920. The third superheated engine reverted to wood-burning and saw the bundle of tubes and flues shortened by 18 inches (457 mm) as well as trimming the grate area. Raising the boiler pressure by 10 psi did not completely offset the impact of adopting less cylinder volume and taller drivers. Like the earlier engines, the cylinders on the 104 were fed steam through 8" (203 mm) piston valves.

104 was later sold to Peavy Wilson and still later scrapped in 1951.

Specifications by Steve Llanso of Sweat House Media
Locobase ID14262 14268
RailroadW B Harbeson Lumber CompanyW B Harbeson Lumber Company
Number in Class31
Road Numbers100, 102-103104
Number Built31
Valve GearWalschaertWalschaert
Locomotive Length and Weight
Driver Wheelbase 9.17'9'
Engine Wheelbase23.75'24.50'
Ratio of driving wheelbase to overall engine wheebase 0.39 0.37
Overall Wheelbase (engine & tender)45.48'50.42'
Axle Loading (Maximum Weight per Axle)
Weight on Drivers69050 lbs84000 lbs
Engine Weight92650 lbs106120 lbs
Tender Light Weight60000 lbs74000 lbs
Total Engine and Tender Weight152650 lbs180120 lbs
Tender Water Capacity3000 gals3500 gals
Tender Fuel Capacity (oil/coal)
Minimum weight of rail (calculated)38 lb/yard47 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter44"46"
Boiler Pressure180 psi190 psi
Cylinders (dia x stroke)15" x 24"16" x 24"
Tractive Effort18777 lbs21571 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.68 3.89
Heating Ability
Firebox Area86 sq. ft93 sq. ft
Grate Area14.10 sq. ft17.90 sq. ft
Evaporative Heating Surface1074 sq. ft1114 sq. ft
Superheating Surface241 sq. ft
Combined Heating Surface1074 sq. ft1355 sq. ft
Evaporative Heating Surface/Cylinder Volume218.79199.46
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation25383401
Same as above plus superheater percentage25384013
Same as above but substitute firebox area for grate area1548020851
Power L140449775
Power MT387.35769.65

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