Southern Aluminum Company 2-4-2 "Columbian" Locomotives in 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.

Principal Dimensions 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 Wheelbase (ft / m)7 / 2.13
Engine Wheelbase (ft / m)21.58 / 6.58
Ratio of driving wheelbase to overall engine wheebase 0.32
Overall Wheelbase (engine & tender) (ft / m)21.58 / 6.58
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)61,000 / 27,669
Engine Weight (lbs / kg)85,000 / 38,555
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)85,000
Tender Water Capacity (gals / ML)1000 / 3.79
Tender Fuel Capacity (oil/coal) (gals/tons / ML/MT)2 / 1.80
Minimum weight of rail (calculated) (lb/yd / kg/m)51 / 25.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)44 / 1118
Boiler Pressure (psi / kPa)180 / 12.40
High Pressure Cylinders (dia x stroke) (in / mm)14" x 22" / 356x559
Tractive Effort (lbs / kg)14,994 / 6801.17
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.07
Heating Ability
Firebox Area (sq ft / m2)70 / 6.50
Grate Area (sq ft / m2)12.80 / 1.19
Evaporative Heating Surface (sq ft / m2)872 / 81.01
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)872 / 81.01
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 area12,600
Power L14115
Power MT297.44

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