Scott Lumber 2-4-2 "Columbian" Locomotives of the USA

Class Details by Steve Llanso of Sweat House Media

Class 15 (Locobase 14271)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Volume 52, p. 282. Works number was 41648 in August 1914.

The four-coupled double-ender wheel arrangement was only rarely seen in any form, still less when pulling a separate tender. The most enthusiastic standard-gauge operator was the Paris-Lyons-Mediterranee, which bought several classes of 2-4-2 express engines in the late 1800s.

Every so often, however, Baldwin would sell such an engine (albeit of much smaller proportions) to short lines or logging roads. The specs show that both trucks enjoyed 4 inches of lateral play to each side to allow the engine snake around sharp curves. Four axles spread the weight out over the 30 lb/yard (15 kg/metre) rail and the modest 0.5% grade offered little challenge. A more usual choice was the 2-6-0 Mogul for its tractive power, but Scott Lumber may have wanted better bidirectional tracking.

Scott Lumber was based in Ayers, SC. The 15 moved on to Central Timber Saw Mills, then Chapman Storm, Holly Hill Lumber. The latter stored the engine in 1957. In 1968, Six-Gun Territory, a theme park in Ocala, Fla, bought the 15 for its tourist road.

The engine was last reported to be under restoration at Savannah, Georgia's, Roundhouse Railroad Museum.

Specifications by Steve Llanso of Sweat House Media
Locobase ID14271
RailroadScott Lumber
Number in Class1
Road Numbers15
Number Built1
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase6'
Engine Wheelbase19.33'
Ratio of driving wheelbase to overall engine wheebase 0.31
Overall Wheelbase (engine & tender)38.08'
Axle Loading (Maximum Weight per Axle)
Weight on Drivers34000 lbs
Engine Weight52000 lbs
Tender Light Weight41000 lbs
Total Engine and Tender Weight93000 lbs
Tender Water Capacity1800 gals
Tender Fuel Capacity (oil/coal)3 tons
Minimum weight of rail (calculated)28 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter42"
Boiler Pressure160 psi
Cylinders (dia x stroke)12" x 18"
Tractive Effort8393 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.05
Heating Ability
Firebox Area46 sq. ft
Grate Area10.20 sq. ft
Evaporative Heating Surface509 sq. ft
Superheating Surface
Combined Heating Surface509 sq. ft
Evaporative Heating Surface/Cylinder Volume216.03
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation1632
Same as above plus superheater percentage1632
Same as above but substitute firebox area for grate area7360
Power L13513
Power MT455.58

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