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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 ...
| South African class 24Remove | |
|---|---|
| Variant | Standard |
| Built | 1949-1950 |
| Manufacturers | North British |
| Wheel arrangement | 1D2 |
| Gauge | 1067 mm |
| Length | 22790 mm |
| Service mass | 74070 kg |
| Top speed | |
| Power | |
| Engine |
General
| Property | South African class 24 Standard Remove |
|---|---|
| Built | 1949-1950 |
| Manufacturers | North British |
| Wheel arrangement | 2-8-4 (Berkshire) |
| Gauge | 1,067 mm |
Dimensions and weights
| Property | South African class 24 Standard Remove |
|---|---|
| Length | 22.79 m |
| Wheelbase | 9.45 m |
| Total wheelbase | 19.89 m |
| Service mass | 74.1 t |
| Adhesion mass | 45.9 t |
| Total mass | 131.5 t |
| Rigid wheelbase | 4.12 m |
| Axle load | 11.7 t |
| Water capacity | 20,547 l |
| Fuel capacity | 9.1 t (coal) |
Boiler
| Property | South African class 24 Standard Remove |
|---|---|
| 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 24 Standard Remove |
|---|---|
| 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 24 Standard Remove |
|---|---|
| Power source | steam |
| Estimated power | 895 kW (1,217 PS) |
| Starting effort | 139.2 kN |
Calculated values
| Property | South African class 24 Standard Remove |
|---|---|
| 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 |
