Tanganyika Railways 2-8-2 Locomotives in Tanganyika


Class Details by Steve Llanso of Sweat House Media

Class MK/Class 25 (Locobase 20908)

Data from No. 44: "Goods Engine and Tender for the Tanganyika Railway-fitted with Superheater", The Vulcan Foundry Locomotive Works catalogue, archived at [link], Plate 44, last accessed 1 July 2021. (Many thanks to Jorge Cerezo Toledo for his 26 June 2021 email containing links to several sites including the Vulcan Catalogue referred to above.) Works numbers were 3892-3896 in 1925 and 3942-3947 in 1926.

Principal Dimensions by Steve Llanso of Middle Run Media
ClassMK/Class 25
Locobase ID20908
RailroadTanganyika Railways
CountryTanganyika
Whyte2-8-2
Number in Class11
Road Numbers206-216/400-410/2501-2511
GaugeMetre
Number Built11
BuilderVulcan Foundry
Year1925
Valve GearWalschaert
Locomotive Length and Weight
Driver Wheelbase (ft / m)12 / 3.66
Engine Wheelbase (ft / m)26.75 / 8.15
Ratio of driving wheelbase to overall engine wheelbase 0.45
Overall Wheelbase (engine & tender) (ft / m)47.58 / 14.50
Axle Loading (Maximum Weight per Axle) (lbs / kg)
Weight on Drivers (lbs / kg)89,600 / 40,642
Engine Weight (lbs / kg)129,360 / 58,677
Tender Loaded Weight (lbs / kg)64,400 / 29,211
Total Engine and Tender Weight (lbs / kg)193,760 / 87,888
Tender Water Capacity (gals / ML)4200 / 15.91
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT)1600 / 6056
Minimum weight of rail (calculated) (lb/yd / kg/m)37 / 18.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)54 / 1372
Boiler Pressure (psi / kPa)160 / 1100
High Pressure Cylinders (dia x stroke) (in / mm)18" x 28" / 457x711 (3)
Tractive Effort (lbs / kg)34,272 / 15545.54
Factor of Adhesion (Weight on Drivers/Tractive Effort) 2.61
Heating Ability
Tubes (number - dia) (in / mm)112 - 2" / 51
Flues (number - dia) (in / mm)19 - 5.25" / 133
Flue/Tube length (ft / m)15.46 / 4.71
Firebox Area (sq ft / m2)139 / 12.91
Grate Area (sq ft / m2)27 / 2.51
Evaporative Heating Surface (sq ft / m2)1445 / 134.25
Superheating Surface (sq ft / m2)297 / 27.59
Combined Heating Surface (sq ft / m2)1742 / 161.84
Evaporative Heating Surface/Cylinder Volume116.81
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation4320
Same as above plus superheater percentage5054
Same as above but substitute firebox area for grate area26,021
Power L15603
Power MT551.45

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