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 Middle Run Media | |
|---|---|
| Class | 3 |
| Locobase ID | 14254 |
| Railroad | Mine La Motte Company |
| Country | USA |
| Whyte | 2-6-2 |
| Number in Class | 1 |
| Road Numbers | 3 |
| Gauge | Std |
| Number Built | 1 |
| Builder | Baldwin |
| Year | 1915 |
| Valve Gear | Stephenson |
| 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 wheelbase | 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 / Liters/MT) | 6 / 6 |
| 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 / 1240 |
| 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 | |
| Tubes (number - dia) (in / mm) | 310 - 2" / 51 |
| Flues (number - dia) (in / mm) | |
| Flue/Tube length (ft / m) | 14.08 / 4.29 |
| 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 Volume | 376.86 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 4194 |
| Same as above plus superheater percentage | 4194 |
| Same as above but substitute firebox area for grate area | 19,080 |
| Power L1 | 6083 |
| Power MT | 421.28 |