Data from No. 44: "Goods Engine and Tender for the Tanganyika Railway-fitted with Superheater", The Vulcan Foundry Locomotive Works catalogue, archived at [], 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 | |
|---|---|
| Class | MK/Class 25 |
| Locobase ID | 20908 |
| Railroad | Tanganyika Railways |
| Country | Tanganyika |
| Whyte | 2-8-2 |
| Number in Class | 11 |
| Road Numbers | 206-216/400-410/2501-2511 |
| Gauge | Metre |
| Number Built | 11 |
| Builder | Vulcan Foundry |
| Year | 1925 |
| Valve Gear | Walschaert |
| 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 Volume | 116.81 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 4320 |
| Same as above plus superheater percentage | 5054 |
| Same as above but substitute firebox area for grate area | 26,021 |
| Power L1 | 5603 |
| Power MT | 551.45 |