Monroe & Southwestern 2-6-2 "Prairie" Locomotives in the USA

Class Details by Steve Llanso of Sweat House Media

Class 4 (Locobase 14049)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Volume 45, p. 44. See also the Tap Line summaries at [] and Moody's Manual of Investments, American and Foreign, Part II - Eighth Year (New York: Moody's Investors Service, 1917), p. 2013. Works number was 40942 in November 1913.

Grayling Lumber Company's 1908 Michigan incorporation represented the consolidation of the Standard Tie Company and Desha Land & Timber. The new company owned over 95,000 acres of Arkansas land in Desha County, Arkansas and Union and Ouachita Parishes in Louisiana. According to Moody's, the company's assets included a Monroe, La saw mill, planing mills, dry kilns, with a capacity of 150,000 feet (double shift) per day. The Arkansas City mill had a capacity of 75,000 feet (single shift) per day.

Altogether, the M & SW had about 10 miles of 40 lb/yard (20 kg/metre) rail and featured grades as high as 6%.

Principal Dimensions by Steve Llanso of Sweat House Media
Locobase ID14,049
RailroadMonroe & Southwestern
Number in Class1
Road Numbers4
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 wheebase 0.39
Overall Wheelbase (engine & tender) (ft / m)45.46 / 13.86
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)65,000 / 29,484
Engine Weight (lbs / kg)90,000 / 40,823
Tender Loaded Weight (lbs / kg)60,000 / 27,216
Total Engine and Tender Weight (lbs / kg)150,000 / 68,039
Tender Water Capacity (gals / ML)3000 / 11.36
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)6 / 5.50
Minimum weight of rail (calculated) (lb/yd / kg/m)36 / 18
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)44 / 1118
Boiler Pressure (psi / kPa)160 / 11
High Pressure Cylinders (dia x stroke) (in / mm)15" x 24" / 381x610
Tractive Effort (lbs / kg)16,691 / 7570.92
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.89
Heating Ability
Firebox Area (sq ft / m2)83 / 7.71
Grate Area (sq ft / m2)14.10 / 1.31
Evaporative Heating Surface (sq ft / m2)1071 / 99.50
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)1071 / 99.50
Evaporative Heating Surface/Cylinder Volume218.18
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation2256
Same as above plus superheater percentage2256
Same as above but substitute firebox area for grate area13,280
Power L13552
Power MT361.42

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Wes Barris