W M Carney Mill Company 2-6-2 "Prairie" Locomotives of 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 http://www.frank-and-anne.com/tag/w-m-carney-mill/, 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).

Specifications by Steve Llanso of Sweat House Media
Locobase ID13,834
RailroadW M Carney Mill Company
Number in Class1
Road Numbers4 / 102
Number Built1
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft)8
Engine Wheelbase (ft)22.75
Ratio of driving wheelbase to overall engine wheebase 0.35
Overall Wheelbase (engine & tender) (ft)
Axle Loading (Maximum Weight per Axle) (lbs)
Weight on Drivers (lbs)57,000
Engine Weight (lbs)77,000
Tender Loaded Weight (lbs)50,500
Total Engine and Tender Weight (lbs)127,500
Tender Water Capacity (gals)2500
Tender Fuel Capacity (oil/coal) (gals/tons)
Minimum weight of rail (calculated) (lb/yd)32
Geometry Relating to Tractive Effort
Driver Diameter (in)44
Boiler Pressure (psi)180
High Pressure Cylinders (dia x stroke) (in)13.5" x 22"
Tractive Effort (lbs)13,942
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.09
Heating Ability
Firebox Area (sq ft)74
Grate Area (sq ft)13.30
Evaporative Heating Surface (sq ft)767
Superheating Surface (sq ft)
Combined Heating Surface (sq ft)767
Evaporative Heating Surface/Cylinder Volume210.44
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 L14118
Power MT477.82

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