Tall Timber Lumber Company 2-6-2 "Prairie" Locomotives in the USA

Class Details by Steve Llanso of Sweat House Media

Class 20 (Locobase 14162)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Volume 48, p. 301. See also Mississippi Rails' entry on the Tall Timber at [] . Works number was 40277 in July 1913.

William Buchanan's many lumber interests included the last of three sawmills to be built in the Jena area near Good Pine, Louisiana. This logging Prairie was bought new at a cost of $11,100. It was identical to the Good Pine #6 (Locobase 12938), which was delivered in 1912. When the Tall Timber stands played out in the 1920s, the 20 moved over to Buchanan's Trout Creek Lumber by March 1927.

Principal Dimensions by Steve Llanso of Sweat House Media
Locobase ID14,162
RailroadTall Timber Lumber Company
Number in Class1
Road Numbers20
Number Built1
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m)10.25 / 3.12
Engine Wheelbase (ft / m)26.83 / 8.18
Ratio of driving wheelbase to overall engine wheebase 0.38
Overall Wheelbase (engine & tender) (ft / m)54.46 / 15.44
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)89,000 / 39,644
Engine Weight (lbs / kg)117,000 / 51,800
Tender Loaded Weight (lbs / kg)90,000 / 40,823
Total Engine and Tender Weight (lbs / kg)207,000 / 92,623
Tender Water Capacity (gals / ML)4000 / 17.05
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)8 / 5.50
Minimum weight of rail (calculated) (lb/yd / kg/m)49 / 24.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)50 / 1118
Boiler Pressure (psi / kPa)170 / 11.70
High Pressure Cylinders (dia x stroke) (in / mm)17" x 24" / 432x610
Tractive Effort (lbs / kg)20,045 / 9092.27
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.44
Heating Ability
Firebox Area (sq ft / m2)121 / 11.24
Grate Area (sq ft / m2)18.20 / 1.69
Evaporative Heating Surface (sq ft / m2)1552 / 144.18
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)1552 / 144.18
Evaporative Heating Surface/Cylinder Volume246.15
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation3094
Same as above plus superheater percentage3094
Same as above but substitute firebox area for grate area20,570
Power L14847
Power MT360.20

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