Southern Aluminum Company 2-4-2 "Columbian" Locomotives of the USA

Class Details by Steve Llanso of Sweat House Media

Class 1 (Locobase 14080)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University, Volume 45, p. 258. Works number was 40546 in September 1913.

SAC's requirements for this engine were not overly demanding. Yes, the maximum grade could reach 3%, but 12 degree curves (radii of 478 feet/146 metres) weren't onerous and the rail weighed a healthy 70 lb/yard (35 kg/metres).

This French-owned firm (L'Aluminium Francaise) was headquartered in Badin, NC. SAC was acquired by Alcoa on 1 November 1915 when the French interests stopped operating because of the European War that had begun 14 months before. At the time, the SAC's unfinished hydro-electric and aluminum plants in Whitney were well under way and were expected to cost millions of dollars to complete. Alcoa created the Tallassee Power Company to finish the hydro plant while the parent took responsibillity for converting the reduction plant from the Bayer process used in Europe to the Hall process favored by Alcoa.

Specifications by Steve Llanso of Sweat House Media
Locobase ID14080
RailroadSouthern Aluminum Company
Number in Class1
Road Numbers1
Number Built1
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase7'
Engine Wheelbase21.58'
Ratio of driving wheelbase to overall engine wheebase 0.32
Overall Wheelbase (engine & tender)21.58'
Axle Loading (Maximum Weight per Axle)
Weight on Drivers61000 lbs
Engine Weight85000 lbs
Tender Light Weight
Total Engine and Tender Weight85000 lbs
Tender Water Capacity1000 gals
Tender Fuel Capacity (oil/coal)2 tons
Minimum weight of rail (calculated)51 lb/yard
Geometry Relating to Tractive Effort
Driver Diameter44"
Boiler Pressure180 psi
Cylinders (dia x stroke)14" x 22"
Tractive Effort14994 lbs
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.07
Heating Ability
Firebox Area70 sq. ft
Grate Area12.80 sq. ft
Evaporative Heating Surface872 sq. ft
Superheating Surface
Combined Heating Surface872 sq. ft
Evaporative Heating Surface/Cylinder Volume222.46
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation2304
Same as above plus superheater percentage2304
Same as above but substitute firebox area for grate area12600
Power L14115
Power MT297.44

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