W G Mitchell Lumber Company 2-6-2 "Prairie" Locomotives in the USA

Class Details by Steve Llanso of Sweat House Media

Class 6 (Locobase 14951)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Vol 65, p. 192+. Works number was 54783 in May 1921.

Baldwin's 45-ton logging Prairie had saturated boilers measuring just under 1,000 sq ft (92.9 sq m) in heating surface area with grate areas of between 13.7 and 14.1 sq ft (1.3 sq m, approximately). By the time this shortleaf lumberer (headquartered in the west central Alabama town of Shortleaf bought its engine, the design was well established. WGMLC's railway profile included 18-degree curves (radii of 210 ft/64 m) and challenging 4% grades.

East Alabama Lumber, which was established about 140 miles (225 km) east near Tuskegee in east central Alabama in 1925, bought the 6 from Mitchell in 1927. The EALC was serious about exploiting timber stands northeast of the town and built 25 miles (42.5 km) miles of railway from Chehaw to Society Hill.

Still numbered 6 a decade later, the locomotive then served the Alabama & Western Florida, a 1926 reorganization of the 19.25 miles run by the Birmingham, Columbus, & St. Andrews between Chipley and Greenhead, Fla.

Principal Dimensions by Steve Llanso of Middle Run Media

Locobase ID14951
RailroadW G Mitchell Lumber Company
Number in Class1
Road Numbers6
Number Built1
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m) 9.17 / 2.80
Engine Wheelbase (ft / m)23.75 / 7.24
Ratio of driving wheelbase to overall engine wheelbase 0.39
Overall Wheelbase (engine & tender) (ft / m)45.17 / 13.77
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)68,000 / 30,844
Engine Weight (lbs / kg)89,000 / 40,370
Tender Loaded Weight (lbs / kg)65,000 / 29,484
Total Engine and Tender Weight (lbs / kg)154,000 / 69,854
Tender Water Capacity (gals / ML)3000 / 11.36
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)6 / 6
Minimum weight of rail (calculated) (lb/yd / kg/m)38 / 19
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)44 / 1118
Boiler Pressure (psi / kPa)190 / 13.10
High Pressure Cylinders (dia x stroke) (in / mm)15" x 20" / 381x508
Tractive Effort (lbs / kg)16,517 / 7491.99
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.12
Heating Ability
Tubes (number - dia) (in / mm)147 - 2" / 51
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)11.87 / 3.62
Firebox Area (sq ft / m2)87 / 8.08
Grate Area (sq ft / m2)14.10 / 1.31
Evaporative Heating Surface (sq ft / m2)995 / 92.44
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)995 / 92.44
Evaporative Heating Surface/Cylinder Volume243.28
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation2679
Same as above plus superheater percentage2679
Same as above but substitute firebox area for grate area16,530
Power L14872
Power MT473.86

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