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 ID13834
RailroadW M Carney Mill Company
Number in Class1
Road Numbers4 / 102
Number Built1
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase8'
Engine Wheelbase22.75'
Ratio of driving wheelbase to overall engine wheebase 0.35
Overall Wheelbase (engine & tender)
Axle Loading (Maximum Weight per Axle)
Weight on Drivers57000 lbs
Engine Weight77000 lbs
Tender Light Weight50500 lbs
Total Engine and Tender Weight127500 lbs
Tender Water Capacity2500 gals
Tender Fuel Capacity (oil/coal)
Minimum weight of rail (calculated)32 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter44"
Boiler Pressure180 psi
Cylinders (dia x stroke)13.5" x 22"
Tractive Effort13942 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.09
Heating Ability
Firebox Area74 sq. ft
Grate Area13.30 sq. ft
Evaporative Heating Surface767 sq. ft
Superheating Surface
Combined Heating Surface767 sq. ft
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 area13320
Power L14118
Power MT477.82

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