Walvis Bay 2-4-2 Locomotives in South_Africa
Class Details by Steve Llanso of Sweat House Media
Class Hope (Locobase 9977)
Data from Pieter Conradie's blog at [
], last accessed 10 March 2009.
The author of this blog says the Kerr, Stuart design (works #652) was based on the SIRDAR type 0-4-0T, but HOPE was modified because of the low track loading - 12 lb/yard - to spread the weight over two more axles. (Gives the reader an idea of just what light rail they were using.) Its running gear was protected from debris by drop-down skirts. Conradie does not give the stroke in his otherwise reasonably full set of specs, so Locobase adopted 10" from another, very similar K, S locomotive.
Even with two more axles, the HOPE seems to have been too heavy and in any event German shippers preferred Swakopmund harbor sent the WB railway into desuetude before World War I. Remarkably, HOPE was not cut up and has been preserved.
NB: The direct heating surface (including the firebox heating surface) is an estimate calculated by subtracting the calculated tube heating surface from the reported total evaporative heating surface.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | Hope |
| Locobase ID | 9977 |
| Railroad | Walvis Bay |
| Country | South Africa |
| Whyte | 2-4-2T |
| Number in Class | 1 |
| Road Numbers | |
| Gauge | 2' |
| Number Built | 1 |
| Builder | Kerr, Stuart & Co |
| Year | 1899 |
| Valve Gear | Stephenson |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | |
| Engine Wheelbase (ft / m) | |
| Ratio of driving wheelbase to overall engine wheelbase | |
| Overall Wheelbase (engine & tender) (ft / m) | |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | 3920 / 1778 |
| Weight on Drivers (lbs / kg) | |
| Engine Weight (lbs / kg) | 12,000 / 5443 |
| Tender Loaded Weight (lbs / kg) | |
| Total Engine and Tender Weight (lbs / kg) | |
| Tender Water Capacity (gals / ML) | 120 / 0.45 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 0.30 / 0.30 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 24 / 610 |
| Boiler Pressure (psi / kPa) | 120 / 830 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 6" x 10" / 152x254 |
| Tractive Effort (lbs / kg) | 1530 / 694.00 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 36 - 1.75" / 44 |
| Flues (number - dia) (in / mm) | |
| Flue/Tube length (ft / m) | 5.08 / 1.55 |
| Firebox Area (sq ft / m2) | 19 / 1.77 |
| Grate Area (sq ft / m2) | 3.50 / 0.33 |
| Evaporative Heating Surface (sq ft / m2) | 102 / 9.48 |
| Superheating Surface (sq ft / m2) | |
| Combined Heating Surface (sq ft / m2) | 102 / 9.48 |
| Evaporative Heating Surface/Cylinder Volume | 311.69 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 420 |
| Same as above plus superheater percentage | 420 |
| Same as above but substitute firebox area for grate area | 2280 |
| Power L1 | 2890 |
| Power MT | |