Tanganyika 4-8-0 Locomotives in Kenya
Class Details by Steve Llanso of Sweat House Media
Class DL/23 (Locobase 4370)
Data from [
] (accessed 23 December 2006); and D Rock Carling, 4-8-0 Tender Locomotives (New York: Drake Publishing, 1972), p.66. See also the Nairobi museum website [] (first accessed November 2002). See also "New Engines for the Tanganyika Ry", Locomotive Magazine, Volume XXIX [29], No 371 (14 July 1923), p.189. Works numbers were 6126-6133 in 1923.
These engines were purchased by Tanganyika Railways as part of a post-World War I reequipment effort. Carling wrote that the sextet were derived from a Uganda Railway design (e.g. Locobase 4317's GD), but BP fitted a larger superheater and longer Belpaire firebox. Originally designed to burn wood (which hadn't enough calories) and later fired with coal (which produced clinker), the class was converted to oil-firing and proved successful.
When the KUR was taken in by the East African Railways, the class was renumbered 2301-2306.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | DL/23 |
| Locobase ID | 4370 |
| Railroad | Tanganyika |
| Country | Kenya |
| Whyte | 4-8-0 |
| Number in Class | 6 |
| Road Numbers | 200-205/300-305/2301-2306 |
| Gauge | Metre |
| Number Built | 6 |
| Builder | Beyer, Peacock |
| Year | 1923 |
| Valve Gear | Walschaert |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 12 / 3.66 |
| Engine Wheelbase (ft / m) | 21.42 / 6.53 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.56 |
| Overall Wheelbase (engine & tender) (ft / m) | |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
| Weight on Drivers (lbs / kg) | 84,448 / 38,305 |
| Engine Weight (lbs / kg) | 107,072 / 48,567 |
| Tender Loaded Weight (lbs / kg) | 64,288 / 29,161 |
| Total Engine and Tender Weight (lbs / kg) | 171,360 / 77,728 |
| Tender Water Capacity (gals / ML) | 3000 / 11.36 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 2425 / 9178.60 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 35 / 17.50 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 43 / 1092 |
| Boiler Pressure (psi / kPa) | 165 / 1140 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 18" x 23" / 457x584 |
| Tractive Effort (lbs / kg) | 24,306 / 11025.03 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 3.47 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | |
| Flues (number - dia) (in / mm) | |
| Flue/Tube length (ft / m) | |
| Firebox Area (sq ft / m2) | 129 / 11.98 |
| Grate Area (sq ft / m2) | 18.30 / 1.70 |
| Evaporative Heating Surface (sq ft / m2) | 1085 / 100.80 |
| Superheating Surface (sq ft / m2) | 249 / 23.13 |
| Combined Heating Surface (sq ft / m2) | 1334 / 123.93 |
| Evaporative Heating Surface/Cylinder Volume | 160.17 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 3020 |
| Same as above plus superheater percentage | 3593 |
| Same as above but substitute firebox area for grate area | 25,329 |
| Power L1 | 6932 |
| Power MT | 723.87 |