Mine La Motte Company 2-6-2 "Prairie" Locomotives in the USA

Class Details by Steve Llanso of Sweat House Media

Class 3 (Locobase 14254)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Volume 52, p. 88. Works number was 42137 in June 1915.

Named (corruptedly) for its founder, Rhode Island native La Mothe, was a well-known pig lead producer. This relatively heavy low-drivered Prairie was tasked to run on 54 lb/yard (27 kg/metre) rail.

By 1923, the engine had been sold to locomotive rebuilder/reseller Birmingham Rail & Locomotive. BR&L sold the "Aberdeen", as it had been dubbed, to New Deemer Manufacturing of New Deemer, Miss. Within a year, New Deemer had sold out to Adams-Newell Lumber Company and that company almost immediately disposed of the 4 with BR&L. In July 1925, Reynolds-West Lumber Company (Burnside, Miss) bought the logging Prairie; this company would later be reorganized as Marietta Lumber Company in 1928.

Principal Dimensions by Steve Llanso of Sweat House Media
Locobase ID14,254
RailroadMine La Motte Company
Number in Class1
Road Numbers3
Number Built1
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m)10 / 3.05
Engine Wheelbase (ft / m)24.75 / 7.54
Ratio of driving wheelbase to overall engine wheebase 0.40
Overall Wheelbase (engine & tender) (ft / m)48.17 / 14.68
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)95,500 / 43,318
Engine Weight (lbs / kg)128,500 / 58,287
Tender Loaded Weight (lbs / kg)70,000 / 31,752
Total Engine and Tender Weight (lbs / kg)198,500 / 90,039
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)53 / 26.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)44 / 1118
Boiler Pressure (psi / kPa)180 / 12.40
High Pressure Cylinders (dia x stroke) (in / mm)17" x 24" / 432x610
Tractive Effort (lbs / kg)24,118 / 10939.75
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.96
Heating Ability
Firebox Area (sq ft / m2)106 / 9.85
Grate Area (sq ft / m2)23.30 / 2.16
Evaporative Heating Surface (sq ft / m2)2378 / 220.92
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)2378 / 220.92
Evaporative Heating Surface/Cylinder Volume377.16
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation4194
Same as above plus superheater percentage4194
Same as above but substitute firebox area for grate area19,080
Power L16088
Power MT421.62

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