Scott Lumber 2-4-2 "Columbian" Locomotives in 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.

Principal Dimensions 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 Wheelbase (ft / m)6 / 1.83
Engine Wheelbase (ft / m)19.33 / 5.89
Ratio of driving wheelbase to overall engine wheebase 0.31
Overall Wheelbase (engine & tender) (ft / m)38.08 / 11.61
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)34,000 / 15,422
Engine Weight (lbs / kg)52,000 / 23,587
Tender Loaded Weight (lbs / kg)41,000 / 18,597
Total Engine and Tender Weight (lbs / kg)93,000 / 42,184
Tender Water Capacity (gals / ML)1800 / 6.82
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)3 / 2.70
Minimum weight of rail (calculated) (lb/yd / kg/m)28 / 14
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)42 / 1067
Boiler Pressure (psi / kPa)160 / 11
High Pressure Cylinders (dia x stroke) (in / mm)12" x 18" / 305x457
Tractive Effort (lbs / kg)8393 / 3807.01
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.05
Heating Ability
Firebox Area (sq ft / m2)46 / 4.27
Grate Area (sq ft / m2)10.20 / 0.95
Evaporative Heating Surface (sq ft / m2)509 / 47.29
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)509 / 47.29
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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Wes Barris