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South African class 24
The class 24 were the only 2-8-4 “Berkshire” locomotives in South Africa. They were designed by M.M. Loubser for use on branch lines with light rails of not much more than 40 pounds per yard or 20 kg per metre. There ...
General
| Property | South African class 24Remove |
|---|---|
| Built | 1949-1950 |
| Manufacturers | North British |
| Wheel arrangement | 2-8-4 (Berkshire) |
| Gauge | 1,067 mm (Cape gauge) |
Dimensions and weights
| Property | South African class 24Remove |
|---|---|
| Length | 22.79 m |
| Wheelbase | 9.45 m |
| Rigid wheelbase | 4.12 m |
| Total wheelbase | 19.89 m |
| Service weight | 74.1 t |
| Adhesive weight | 45.9 t |
| Axle load | 11.7 t |
| Total weight | 131.5 t |
| Water capacity | 20,547 l |
| Fuel capacity | 9.1 t (coal) |
Boiler
| Property | South African class 24Remove |
|---|---|
| Grate area | 3.345 m² |
| Firebox surface | 12.914 m² |
| Tube heating surface | 139.076 m² |
| Evaporative heating surface | 151.99 m² |
| Superheater surface | 35.303 m² |
| Total heating surface | 187.3 m² |
Power plant
| Property | South African class 24Remove |
|---|---|
| Driver diameter | 1,295 mm |
| Boiler pressure | 13.8 bar |
| Expansion type | simple expansion |
| Cylinders | two, 483 x 660 mm |
Power
| Property | South African class 24Remove |
|---|---|
| Power source | steam |
| Estimated power | 895 kW (1,217 PS) |
| Starting effort | 139.2 kN |
Calculated values
| Property | South African class 24Remove |
|---|---|
| Factor of adhesion | 1 : 3.24 |
| Optimal speed | 39 km/h |
| Power-to-weight ratio | 12.1 kW/t |
| Heating Surface Equivalent | 287.2 m² |
| Cylinder volume/HSE | 1 : 841.33 |
| Adhesive weight/Total | 1 : 1.61 |
| Tractive force/Heating surface | 1 : 15.52 |
| Grate area/Heating surface | 1 : 55.99 |
| Firebox/Tube surface | 1 : 10.77 |
| Total/Superheater | 1 : 4.31 |
