Data from South African Railways & Harbors 8 - 1941 locomotive diagrams supplied in August 2013 by Allen Stanley from his extensive Rail Data Exchange. See also Wikipedia at [], last accessed 1 June 2015 and Piet Conradie's blog post of 24 November 2007 for old STEAM LOCOMOTIVES in South Africa at [
] , last accessed 1 June 2015. Works numbers were 10720-10722 in 1912.
There's only so much a designer can do to give a 2'-ft gauge freight locomotive well-proportioned lines. The cab has to be big enough to house two full-grown people while the drivers must be tiny to generate tractive effort suitable for a Mikado layout. Conradie's post says that the engines had dust covers to protect the motion and that both auxiliary axles were mounted in radial boxes to allow lateral motion. They were delivered with large steam and sand domes, but the railway later removed the sand dome and replaced it with a pair of sand boxes mounted on the running board.
This trio was delivered to the SWA while that railway was still operated by German interests. The class was leased by the Otavi Mining and Railway Company to haul trains between Swakopmund and Karibib. When South Africa was installed as the Mandatory Power over SWA after World War I, the three engines remained in service and in 1928 were taken into the
These engines served the SAR well for almost forty years before entering retirement in November 1960 because the gauge was widened to 3 ft 6 in (1,067 mm).
Principal Dimensions by Steve Llanso of Middle Run Media | |
---|---|
Class | Hd/NG5-40 |
Locobase ID | 993 |
Railroad | South West African |
Country | South Africa |
Whyte | 2-8-2 |
Number in Class | 6 |
Road Numbers | 40-42/NG40 - NG42 |
Gauge | 2' |
Number Built | 6 |
Builder | Henschel & Sohn |
Year | 1912 |
Valve Gear | Walschaert |
Locomotive Length and Weight | |
Driver Wheelbase (ft / m) | 9.56 / 2.91 |
Engine Wheelbase (ft / m) | 17.06 / 5.20 |
Ratio of driving wheelbase to overall engine wheelbase | 0.56 |
Overall Wheelbase (engine & tender) (ft / m) | 38.55 / 11.75 |
Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
Weight on Drivers (lbs / kg) | |
Engine Weight (lbs / kg) | 73,584 / 33,377 |
Tender Loaded Weight (lbs / kg) | 57,540 / 26,100 |
Total Engine and Tender Weight (lbs / kg) | 131,124 / 59,477 |
Tender Water Capacity (gals / ML) | 3432 / 13 |
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 3.19 / 3 |
Minimum weight of rail (calculated) (lb/yd / kg/m) | |
Geometry Relating to Tractive Effort | |
Driver Diameter (in / mm) | 33.90 / 861 |
Boiler Pressure (psi / kPa) | 174 / 1200 |
High Pressure Cylinders (dia x stroke) (in / mm) | 15.75" x 17.72" / 400x450 |
Tractive Effort (lbs / kg) | 19,178 / 8699.00 |
Factor of Adhesion (Weight on Drivers/Tractive Effort) | |
Heating Ability | |
Tubes (number - dia) (in / mm) | 112 - 1.75" / 44 |
Flues (number - dia) (in / mm) | 14 - 4.724" / 120 |
Flue/Tube length (ft / m) | 13.12 / 4 |
Firebox Area (sq ft / m2) | 67.79 / 6.30 |
Grate Area (sq ft / m2) | 16.14 / 1.50 |
Evaporative Heating Surface (sq ft / m2) | 948 / 88.07 |
Superheating Surface (sq ft / m2) | 149 / 13.84 |
Combined Heating Surface (sq ft / m2) | 1097 / 101.91 |
Evaporative Heating Surface/Cylinder Volume | 237.25 |
Computations Relating to Power Output (More Information) | |
Robert LeMassena's Power Computation | 2808 |
Same as above plus superheater percentage | 3202 |
Same as above but substitute firebox area for grate area | 13,447 |
Power L1 | 6466 |
Power MT |