Data from "Exceptional Locomotives in British Design & Practice", Railway Magazine, Volume 35, , pp. 457-458 . See also "New Engines for the Uganda Railway", Locomotive Magazine, Volume XX [20] (15 July 1914), p. 149. See also the reprint of Frederick A Talbot's 1913 article online at "Railway Wonders of the World -- Railways of the Empire 22", [], last accessed 24 October 2017.
This design might be described as a "Colonial Mallet" because its operator, which actually ran in the East Africa Protectorate, ordered the same specifications as the 0-6-6-0s delivered to the British-owned West of Goa Railway in India (Locobase 2016) and the ones purchased by the Burma Railways (Locobase 20108) In addition to the dimensions, areas, and weights, the class had the same Belpaire fireboxes and slide valves on all cylinders.
The challenges offered by the terrain and the mostly westbound import traffic meant one of these Mallets needed to pull a 170 ton train up a long 4% grade at 6 mph (10 kph) and 200 tons up a 2 1/2% grade at 12 mph (20 kph).
Work went slowly for a number of reasons Talbot spelled out in his account. His Imperial satisfaction at the results fully flowers in his last few sentences: "The journey from Mombasa to the Lake [Victoria Nyanza] occupies about forty-eight hours - a striking contrast to the four monthsñ painful, weary and hazardous toil involved before the coming of the line. The construction of the Uganda Railway offers one of the most illuminating instances in the history of the railway in the complete subjugation of a hostile country, a great deal of which was terra incognita. In fact, so little was known about the land before the engineers arrived that while construction was in progress the surveyors were able to revise the route and to reduce the original location by about 100 miles."
Principal Dimensions by Steve Llanso of Middle Run Media | |
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Class | Mallets |
Locobase ID | 20307 |
Railroad | Uganda Railway |
Country | Kenya |
Whyte | 0-6-6-0 |
Number in Class | 18 |
Road Numbers | |
Gauge | Metre |
Number Built | 18 |
Builder | North British |
Year | 1913 |
Valve Gear | Walschaert |
Locomotive Length and Weight | |
Driver Wheelbase (ft / m) | 8.25 / 2.51 |
Engine Wheelbase (ft / m) | 24.25 / 7.39 |
Ratio of driving wheelbase to overall engine wheelbase | 0.34 |
Overall Wheelbase (engine & tender) (ft / m) | 48.58 |
Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
Weight on Drivers (lbs / kg) | 135,072 / 60,963 |
Engine Weight (lbs / kg) | 135,072 / 60,963 |
Tender Loaded Weight (lbs / kg) | 71,008 / 24,080 |
Total Engine and Tender Weight (lbs / kg) | 206,080 / 85,043 |
Tender Water Capacity (gals / ML) | 2400 / 9.09 |
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 4.40 / 4 |
Minimum weight of rail (calculated) (lb/yd / kg/m) | 38 / 19 |
Geometry Relating to Tractive Effort | |
Driver Diameter (in / mm) | 39 / 991 |
Boiler Pressure (psi / kPa) | 180 / 1240 |
High Pressure Cylinders (dia x stroke) (in / mm) | 15.5" x 20" / 394x508 |
Low Pressure Cylinders (dia x stroke) (in / mm) | 24.25" x 20" / 610x508 |
Tractive Effort (lbs / kg) | 26,766 / 12140.87 |
Factor of Adhesion (Weight on Drivers/Tractive Effort) | 5.05 |
Heating Ability | |
Tubes (number - dia) (in / mm) | 178 - 2" / 0 |
Flues (number - dia) (in / mm) | |
Flue/Tube length (ft / m) | 15 |
Firebox Area (sq ft / m2) | 115 / 10.68 |
Grate Area (sq ft / m2) | 33 / 3.07 |
Evaporative Heating Surface (sq ft / m2) | 1513 / 140.56 |
Superheating Surface (sq ft / m2) | |
Combined Heating Surface (sq ft / m2) | 1513 / 140.56 |
Evaporative Heating Surface/Cylinder Volume | 346.39 |
Computations Relating to Power Output (More Information) | |
Robert LeMassena's Power Computation | 5940 |
Same as above plus superheater percentage | 5940 |
Same as above but substitute firebox area for grate area | 20,700 |
Power L1 | 2285 |
Power MT | 223.77 |