A L Clark Lumber Company 2-6-2 "Prairie" Locomotives in the USA

Class Details by Steve Llanso of Sweat House Media

Class 3 (Locobase 11727)

Data from Negative 4827, Southern Methodist University, Central University Libraries, DeGolyer Library collection of digitized Baldwin images, retrieved 26 October 2010 from [] . Works number was 41016 in December 1913.

Another of a widely distributed set of Baldwin logging Prairies. A L Clark operated the 3 for a while near Glenwood, Ark, then sold it to White Grandin Lumber Company of Grandin, Mo..

Principal Dimensions by Steve Llanso of Sweat House Media
Locobase ID11,727
RailroadA L Clark Lumber Company
Number in Class1
Road Numbers3
Number Built1
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m)10 / 3.05
Engine Wheelbase (ft / m)25.25 / 7.70
Ratio of driving wheelbase to overall engine wheebase 0.40
Overall Wheelbase (engine & tender) (ft / m)46.83 / 14.27
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)77,000 / 34,927
Engine Weight (lbs / kg)101,000 / 45,813
Tender Loaded Weight (lbs / kg)69,000 / 31,298
Total Engine and Tender Weight (lbs / kg)170,000 / 77,111
Tender Water Capacity (gals / ML)3500 / 13.26
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)6 / 5.50
Minimum weight of rail (calculated) (lb/yd / kg/m)43 / 21.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)44 / 1118
Boiler Pressure (psi / kPa)170 / 11.70
High Pressure Cylinders (dia x stroke) (in / mm)16" x 24" / 406x610
Tractive Effort (lbs / kg)20,177 / 9152.14
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.82
Heating Ability
Firebox Area (sq ft / m2)88 / 8.18
Grate Area (sq ft / m2)14.40 / 1.34
Evaporative Heating Surface (sq ft / m2)1603 / 148.98
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)1603 / 148.98
Evaporative Heating Surface/Cylinder Volume287.02
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation2448
Same as above plus superheater percentage2448
Same as above but substitute firebox area for grate area14,960
Power L14560
Power MT391.68

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