Data from "Railway Notes - Tunis Railway", The Locomotive Magazine, Vol XIII (15 Septermber 1907), p. 156.
The Sfax-Gafsa was opened in 1899 to exploit the large reserves of phosphates and iron in the south. This low-drivered octet of Consolidations featured a rounded dome sited over the leading coupled axle, "trash-can" sandbox over the second coupled axle, Belpaire firebox, inside frame and outside cylinders and valve motion, and semi-enclosed cab.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | 21 |
| Locobase ID | 10623 |
| Railroad | Sfax-Gafsa |
| Country | Tunisia |
| Whyte | 2-8-0 |
| Number in Class | 8 |
| Road Numbers | 21-28 |
| Gauge | Metre |
| Number Built | 8 |
| Builder | SACM |
| Year | 1904 |
| Valve Gear | Walschaert |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 11.58 / 3.53 |
| Engine Wheelbase (ft / m) | 17.81 / 5.43 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.65 |
| Overall Wheelbase (engine & tender) (ft / m) | |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
| Weight on Drivers (lbs / kg) | |
| Engine Weight (lbs / kg) | |
| Tender Loaded Weight (lbs / kg) | |
| Total Engine and Tender Weight (lbs / kg) | |
| Tender Water Capacity (gals / ML) | |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 43.30 / 1100 |
| Boiler Pressure (psi / kPa) | 169.70 / 1170 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 16.93" x 22.05" / 430x560 |
| Tractive Effort (lbs / kg) | 21,054 / 9549.95 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 171 - 1.732" / 44 |
| Flues (number - dia) (in / mm) | |
| Flue/Tube length (ft / m) | 13.09 / 3.99 |
| Firebox Area (sq ft / m2) | 99.64 / 9.26 |
| Grate Area (sq ft / m2) | 13.67 / 1.27 |
| Evaporative Heating Surface (sq ft / m2) | 1117 / 103.80 |
| Superheating Surface (sq ft / m2) | |
| Combined Heating Surface (sq ft / m2) | 1117 / 103.80 |
| Evaporative Heating Surface/Cylinder Volume | 194.43 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 2320 |
| Same as above plus superheater percentage | 2320 |
| Same as above but substitute firebox area for grate area | 16,909 |
| Power L1 | 3443 |
| Power MT | |