Sfax-Gafsa 2-8-0 Locomotives in Tunisia

Class Details by Steve Llanso of Sweat House Media

Class 21 (Locobase 10623)

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 Sweat House Media

Locobase ID10623
Number in Class8
Road Numbers21-28
Number Built8
Valve GearWalschaert
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 / 11.70
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 Volume194.43
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation2320
Same as above plus superheater percentage2320
Same as above but substitute firebox area for grate area16,909
Power L13443
Power MT

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