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 Middle Run Media | |
|---|---|
| Class | 1 |
| Locobase ID | 14080 |
| Railroad | Southern Aluminum Company |
| Country | USA |
| Whyte | 2-4-2ST |
| Number in Class | 1 |
| Road Numbers | 1 |
| Gauge | Std |
| Number Built | 1 |
| Builder | Baldwin |
| Year | 1913 |
| Valve Gear | Stephenson |
| 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 wheelbase | 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) | |
| Tender Water Capacity (gals / ML) | 1000 / 3.79 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 2 / 2 |
| 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 / 1240 |
| 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 | |
| Tubes (number - dia) (in / mm) | 145 - 2" / 51 |
| Flues (number - dia) (in / mm) | |
| Flue/Tube length (ft / m) | 10.65 / 3.25 |
| 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 Volume | 222.45 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 2304 |
| Same as above plus superheater percentage | 2304 |
| Same as above but substitute firebox area for grate area | 12,600 |
| Power L1 | 4115 |
| Power MT | 297.44 |