Sudan Railway 4-4-0 Locomotives in Sudan


Class Details by Steve Llanso of Sweat House Media

Class Tamai (Locobase 10429)

Data from "The Cape to Cairo Railway," The Locomotive Magazine, Vol IX (26 December 1903), pp. 372-373. Works number was 1646.

This was a small oil-burning Eight-wheeler that had its slender dome placed forward of the coupled axles, a capped stack, prominent safety-valve stand just ahead of the cab,and an unusual tender layout in which the leading axle was a single fixed unit and the trailing axles were held in a swiveling bogie.

Compared to other Cape-gauge 4-4-0s, the Tamai fell a bit below the average while not descending to "tiny". Its oil-fired boiler reflected the dearth of coal in its operating area.


Class Tokar/Class 36 (Locobase 12261)

Data from Baldwin Locomotive Works Specification for Engines as digitized by the DeGolyer Library of Southern Methodist University Volume 21, p.143. See also "Baldwin Locomotives for the Soudan [sic]", American Engineer, Car Builder and Railroad Journal, Volume 72, No 4 (April 1898), p. 138. Works numbers were 16475-16477 in January 1899.

This quartet of Eight-wheelers were the first to be bought from the US for operation in Sudan. Their copper fireboxes were designed to burn small Welsh coal and "afterwards oil." So Baldwin shipped an oil tank for each engine that would carry 1,100 US gallons (917 Imperial gallons).

Their purchase by the British War Office, a source rarely disposed to consider American locomotives, stemmed from an urgent need to obtain passenger power for Kitchener's military railway. The order arrived in Philadelphia on 6 January 1898 with the requirement that the locomotives be shipped by March 6. Baldwin beat the deadline by almost a month when it loaded the engines on board SS Stalheim on 11 February. Their names, in order of road number, were Tokar, Tambuk, Sinkat, and Amur.

Principal Dimensions by Steve Llanso of Middle Run Media
ClassTamaiTokar/Class 36
Locobase ID10429 12261
RailroadSudan RailwaySudan Railway
CountrySudanSudan
Whyte4-4-04-4-0
Number in Class14
Road Numbers3536-39
Gauge3'6"3'6"
Number Built14
BuilderKitson & CoBurnham, Williams & Co
Year19021898
Valve GearStephensonStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m) 6.42 / 1.96 6.50 / 1.98
Engine Wheelbase (ft / m)20.42 / 6.2219.50 / 5.94
Ratio of driving wheelbase to overall engine wheelbase 0.31 0.33
Overall Wheelbase (engine & tender) (ft / m)
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)50,000 / 22,680
Engine Weight (lbs / kg)71,120 / 32,26072,000 / 32,659
Tender Loaded Weight (lbs / kg)73,360 / 33,27650,000 / 22,680
Total Engine and Tender Weight (lbs / kg)144,480 / 65,536122,000 / 55,339
Tender Water Capacity (gals / ML)2880 / 10.912400 / 9.09
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)1320 / 49961100 / 4164
Minimum weight of rail (calculated) (lb/yd / kg/m)42 / 21
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)48 / 121960 / 1524
Boiler Pressure (psi / kPa)150 / 1030160 / 1100
High Pressure Cylinders (dia x stroke) (in / mm)15" x 24" / 381x61015" x 24" / 381x610
Tractive Effort (lbs / kg)14,344 / 6506.3412,240 / 5551.98
Factor of Adhesion (Weight on Drivers/Tractive Effort) 4.08
Heating Ability
Tubes (number - dia) (in / mm)165 - 1.75" / 44182 - 1.75" / 44
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)10.67 / 3.25
Firebox Area (sq ft / m2)85.50 / 7.9591 / 8.46
Grate Area (sq ft / m2)15.20 / 1.4113.70 / 1.27
Evaporative Heating Surface (sq ft / m2)853 / 79.28980 / 91.08
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)853 / 79.28980 / 91.08
Evaporative Heating Surface/Cylinder Volume173.77199.64
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation22802192
Same as above plus superheater percentage22802192
Same as above but substitute firebox area for grate area12,82514,560
Power L131304677
Power MT412.44

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