W M Carney Mill Company 2-6-2 "Prairie" Locomotives in the USA

Class Details by Steve Llanso of Sweat House Media

Class 4 (Locobase 13834)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Volume 39, p. 87. See also the Frank-and-Anne correspondence [], last accessed 4 February 2012. Works number was 36775 in August 1911.

Given that the 4 had to traverse 30-lb/yard (15-kg/metre) rail, this little wood-burning Prairie had to be a light stepper in the woods near Atmore, Ala. Atmore lies on the very northestern point of the border between Alabama and Florida.

The W Carney Mill Company sold the 4 after about 12 years of service to locomotive rebuilder/reseller Birmingham Rail & Locomotive. BR & L found Russ Lumber of Arcadia, Fla would buy the engine in August 1924 as thei 102. As the 4/102 was one of Baldwin's standard logging Prairie designs, it wasn't a big surprise when its next owner was Nocatee Crate (of Nocatee, Fla).

Principal Dimensions by Steve Llanso of Sweat House Media

Locobase ID13834
RailroadW M Carney Mill Company
Number in Class1
Road Numbers4 / 102
Number Built1
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m)8 / 3.35
Engine Wheelbase (ft / m)22.75 / 6.48
Ratio of driving wheelbase to overall engine wheelbase 0.35
Overall Wheelbase (engine & tender) (ft / m) / 14
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)57,000 / 25,401
Engine Weight (lbs / kg)77,000 / 34,473
Tender Loaded Weight (lbs / kg)50,500 / 19,958
Total Engine and Tender Weight (lbs / kg)127,500 / 54,431
Tender Water Capacity (gals / ML)2500 / 7.58
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) / 3
Minimum weight of rail (calculated) (lb/yd / kg/m)32 / 16
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)44 / 1067
Boiler Pressure (psi / kPa)180 / 11.70
High Pressure Cylinders (dia x stroke) (in / mm)13.5" x 22" / 330x559
Tractive Effort (lbs / kg)13,942 / 6323.99
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.09
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 Volume210.71
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation2394
Same as above plus superheater percentage2394
Same as above but substitute firebox area for grate area13,320
Power L14123
Power MT478.40

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