Manchester Saw Mills 2-6-2 "Prairie" Locomotives in the USA

Class Details by Steve Llanso of Sweat House Media

Class 4 (Locobase 14127)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Volume 43, p. 239. Works number was 39381 in February 1913.

The Manchester Saw Mills operated about 6.5 miles of track between Manchester, Ala and Sunlight and sometimes operated logging trains on the nearby Alabama Central Railroad. (A duplicate #4 emerged from Eddystone in the same month to serve Traverse City, Mich's Empire Lumber Company; see Locobase 13952.) The Baldwin spec for both locomotives referred to errors in diameter for the leading and trailing truck wheels. Locobase notes that the original spec entry showed 24" (610 mm) wheel diameters, which was then lined out in pen and changed to 26" (660 mm). It's not clear to Locobase whose mistake this might have been.

MSM told the AC in January 1926 that it had finished logging timber in the area. It then sold the 4 to locomotive rebuilder/reseller Birmingham Rail & Locomotive in October 1926. BR&L would sell the 4 more than two years later to Gibson Justis Co in May 1929 as their #12.

Principal Dimensions by Steve Llanso of Sweat House Media

Locobase ID14127
RailroadManchester Saw Mills
Number in Class1
Road Numbers4
Number Built1
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m)8 / 2.44
Engine Wheelbase (ft / m)22.75 / 6.93
Ratio of driving wheelbase to overall engine wheelbase 0.35
Overall Wheelbase (engine & tender) (ft / m)44.33 / 13.51
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)56,500 / 25,628
Engine Weight (lbs / kg)76,500 / 34,700
Tender Loaded Weight (lbs / kg)51,000 / 23,133
Total Engine and Tender Weight (lbs / kg)127,500 / 57,833
Tender Water Capacity (gals / ML)2500 / 9.47
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) 3.50 / 3
Minimum weight of rail (calculated) (lb/yd / kg/m)31 / 15.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)42 / 1067
Boiler Pressure (psi / kPa)170 / 11.70
High Pressure Cylinders (dia x stroke) (in / mm)13" x 22" / 330x559
Tractive Effort (lbs / kg)12,792 / 5802.36
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.42
Heating Ability
Tubes (number - dia) (in / mm)116 - 2" / 51
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)11.50 / 3.51
Firebox Area (sq ft / m2)74 / 6.87
Grate Area (sq ft / m2)13.30 / 1.24
Evaporative Heating Surface (sq ft / m2)767 / 71.26
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)767 / 71.26
Evaporative Heating Surface/Cylinder Volume226.92
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation2261
Same as above plus superheater percentage2261
Same as above but substitute firebox area for grate area12,580
Power L14003
Power MT468.59

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