Sudan Railway 4-6-0 Locomotives in Sudan

Class Details by Steve Llanso of Sweat House Media

Class Darfur (Locobase 10341)

Data from "Rebuilt in the Soudan [sic]," The Locomotive Magazine, Vol VIII (13 June 1903), pp. 412. Boiler pressure is an estimate.

This locomotive was delivered the Sudan in 1897 as a 2-6-2 but its weight distribution proved unsatisfactory and the axles were rearranged to place all three drivers on each side behind a bogie. Darfur (a name that would gain a chilling cast a century later) had the usual marks of a British-built goods engine: straight, low running board, polished-brass dome over the center driver, outside cylinder supplied by inside Stephenson link motion.

In 1903, the author noted that the SR was an important part of the Cape-to-Cairo scheme and was to link up to the South African Railways for through running. Break of gauge from the Egyptian Railway's standard width occurred at Luxor, at which point steamers brought passengers and goods to Wady Halfa. Distance from the latter to Khartoum amounted to 575 miles - as good an indicator as any of just how ambitious was Cecil Rhodes' grand plan.

Principal Dimensions by Steve Llanso of Sweat House Media

Locobase ID10341
RailroadSudan Railway
Number in Class1
Road Numbers
Number Built1
BuilderWady Halfa
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m)11 / 3.35
Engine Wheelbase (ft / m)20.42 / 6.22
Ratio of driving wheelbase to overall engine wheelbase 0.54
Overall Wheelbase (engine & tender) (ft / m)
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)
Engine Weight (lbs / kg)99,680 / 45,214
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)42 / 1067
Boiler Pressure (psi / kPa)160 / 11
High Pressure Cylinders (dia x stroke) (in / mm)14" x 20" / 356x508
Tractive Effort (lbs / kg)12,693 / 5757.45
Factor of Adhesion (Weight on Drivers/Tractive Effort)
Heating Ability
Tubes (number - dia) (in / mm)119 - 1.75" / 44
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)
Firebox Area (sq ft / m2)72 / 6.69
Grate Area (sq ft / m2)11.50 / 1.07
Evaporative Heating Surface (sq ft / m2)687 / 63.85
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)687 / 63.85
Evaporative Heating Surface/Cylinder Volume192.79
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation1840
Same as above plus superheater percentage1840
Same as above but substitute firebox area for grate area11,520
Power L13291
Power MT

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