Data from "Namaqualand 0-6-2 Clara Class" in Wikipedia at [], last accessed 26 July 2020. Works numbers were T246, T258, T261 in 1890-1893.
The Cape of Good Hope (Cape Colony) was a British possession in extreme southern Africa. One reason for the interest in the area were the copper mines. As they were developed, the Cape Copper Mining Company built a 150 km (93.5 mile) railway on the 2' 6" gauge (762 mm). This connected the mines around O'okiep to Port Nolloth.
Rising from the coast, the railway encountered mountainous terrain that needed more power to haul the trains, especially those loaded with coke to support the mine-based smelting. These relatively large (for the gauge) radial tanks were the answer.
They soon acquired the "Mountain" nickname for their success. Clara was soon joined by Marie and James Kitson.
In addition to the grades, NR locomotives had to cope with abrasive sand blown by persistent winds and corrosive water. Like many engines in sandy settings, the Claras wore skirts that protected the motion and running gear. After a few years, the class showed "major problems" with their boilers and fireboxes. This was remedied by reconditioning the boilers.
The trio continued to serve copper even after the Cape Copper Company folded in 1922. South African Copper and later O'okliep operated all three until the early 1940s. Marie and James Kitson were scrapped by 1942.
Clara cntinued shunting at O'okliep and hauling local trains between O'okliep and Nababeep. Retired in 1950, the engine eventually wound on a plinth erected at the Nababeep mine, on diplay at the Peter Philip Museum in town
Principal Dimensions by Steve Llanso of Middle Run Media | |
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Class | Clara |
Locobase ID | 20766 |
Railroad | Namaqualand |
Country | South Africa |
Whyte | 0-6-2 |
Number in Class | 3 |
Road Numbers | 4-6 |
Gauge | 2'6" |
Number Built | 3 |
Builder | Kitson & Co |
Year | 1890 |
Valve Gear | Stephenson |
Locomotive Length and Weight | |
Driver Wheelbase (ft / m) | 6.25 / 1.90 |
Engine Wheelbase (ft / m) | 11.25 / 3.43 |
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) | 50,619 / 22,960 |
Engine Weight (lbs / kg) | 75,266 / 34,140 |
Tender Loaded Weight (lbs / kg) | 24,640 / 11,177 |
Total Engine and Tender Weight (lbs / kg) | 99,906 / 45,317 |
Tender Water Capacity (gals / ML) | 1200 / 4.55 |
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 2 / 2 |
Minimum weight of rail (calculated) (lb/yd / kg/m) | 28 / 14 |
Geometry Relating to Tractive Effort | |
Driver Diameter (in / mm) | 36 / 914 |
Boiler Pressure (psi / kPa) | 150 / 1030 |
High Pressure Cylinders (dia x stroke) (in / mm) | 14" x 21" / 356x533 |
Tractive Effort (lbs / kg) | 14,578 / 6612.48 |
Factor of Adhesion (Weight on Drivers/Tractive Effort) | 3.47 |
Heating Ability | |
Tubes (number - dia) (in / mm) | 136 - 1.75" / 44 |
Flues (number - dia) (in / mm) | |
Flue/Tube length (ft / m) | 9.10 / 2.77 |
Firebox Area (sq ft / m2) | 61.60 / 5.72 |
Grate Area (sq ft / m2) | 11.50 / 1.07 |
Evaporative Heating Surface (sq ft / m2) | 617 / 57.32 |
Superheating Surface (sq ft / m2) | |
Combined Heating Surface (sq ft / m2) | 617 / 57.32 |
Evaporative Heating Surface/Cylinder Volume | 164.90 |
Computations Relating to Power Output (More Information) | |
Robert LeMassena's Power Computation | 1725 |
Same as above plus superheater percentage | 1725 |
Same as above but substitute firebox area for grate area | 9240 |
Power L1 | 2225 |
Power MT | 290.72 |