Larson Timber 2-6-6-2 Locomotives of the USA

Class Details by Steve Llanso of Sweat House Media

Class 14 (Locobase 4044)

Data from and DeGolyer, Vol 73, pp. 280+.Works number was 60256 in November 1927.

This Prairie Mallet for logging service was considerably more powerful than the two earlier 2-6-6-2Ts delivered to Bloedel-Donovan Lumber Mills in 1924 (Locobase 4044). The specs said that this oil-burner would encounter 2% adverse grades when pulling loads, 3 1/2% when hauling empties, all on 70 lb/yard (35 kg/metre) rail and around 24-degree curves (240 feet/73 metre radii). And at the time of its manufacture, 14's railroad included more than 90 miles (145 km) of line.

This later engine's tender was lettered for Bloedel Donovan Lumber Mills before its delivery. (Larson Lumber had merged with BD in 1913.) The engine then went to Port Angeles Western (in Port Angeles, Wash) and then Rayonier, Inc. of Sekiu, Wash.

The 14 was withdrawn in 1964 and scrapped in 1968.

Specifications by Steve Llanso of Sweat House Media
Locobase ID4044
RailroadLarson Timber
Number in Class1
Road Numbers14
Number Built1
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase9'
Engine Wheelbase26.75'
Ratio of driving wheelbase to overall engine wheebase 0.34
Overall Wheelbase (engine & tender)65.25'
Axle Loading (Maximum Weight per Axle)
Weight on Drivers250000 lbs
Engine Weight275000 lbs
Tender Light Weight100000 lbs
Total Engine and Tender Weight375000 lbs
Tender Water Capacity5000 gals
Tender Fuel Capacity (oil/coal)1500 gals
Minimum weight of rail (calculated)69 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter51"
Boiler Pressure215 psi
High Pressure Cylinders (dia x stroke)20" x 28"
Low Pressure Cylinders (dia x stroke)31" x 28" (2)
Tractive Effort56676 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.41
Heating Ability
Firebox Area198 sq. ft
Grate Area57.20 sq. ft
Evaporative Heating Surface3612 sq. ft
Superheating Surface812 sq. ft
Combined Heating Surface4424 sq. ft
Evaporative Heating Surface/Cylinder Volume354.78
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation12298
Same as above plus superheater percentage14512
Same as above but substitute firebox area for grate area50233
Power L18898
Power MT470.80

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