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South African class 25
In the desert areas of the Karoo and Kalahari, the large water requirements of powerful steam locomotives posed a major problem for the SAR. The contract for the development of a 4-8-4 locomotive and a condensation te...
| South African class 25Remove | |
|---|---|
| Variant | Standard |
| Built | 1953 |
| Manufacturers | Henschel;North British |
| Wheel arrangement | 2D2 |
| Gauge | |
| Length | 32768 mm |
| Service mass | 122383 kg |
| Top speed | |
| Power | |
| Engine |
General
| Property | South African class 25 Standard Remove |
|---|---|
| Built | 1953 |
| Manufacturers | Henschel, North British |
| Wheel arrangement | 4-8-4 (Northern) |
Dimensions and weights
| Property | South African class 25 Standard Remove |
|---|---|
| Length | 32.77 m |
| Wheelbase | 11.58 m |
| Total wheelbase | 29.00 m |
| Service mass | 122.4 t |
| Adhesion mass | 78.1 t |
| Total mass | 238.1 t |
| Rigid wheelbase | 4.80 m |
| Axle load | 19.6 t |
| Water capacity | 22,731 l |
| Fuel capacity | 19.3 t (coal) |
Boiler
| Property | South African class 25 Standard Remove |
|---|---|
| Grate area | 6.503 m² |
| Firebox surface | 30.751 m² |
| Tube heating surface | 284.191 m² |
| Evaporative heating surface | 314.942 m² |
| Superheater surface | 58.529 m² |
| Total heating surface | 373.5 m² |
Power plant
| Property | South African class 25 Standard Remove |
|---|---|
| Driver diameter | 1,524 mm |
| Boiler pressure | 15.5 bar |
| Expansion type | simple expansion |
| Cylinders | two, 610 x 711 mm |
Power
| Property | South African class 25 Standard Remove |
|---|---|
| Power source | steam |
| Estimated power | 2,498 kW (3,396 PS) |
| Starting effort | 228.7 kN |
Calculated values
| Property | South African class 25 Standard Remove |
|---|---|
| Factor of adhesion | 1 : 3.35 |
| Optimal speed | 68 km/h |
| Power-to-weight ratio | 20.4 kW/t |
| Heating Surface Equivalent | 585.8 m² |
| Cylinder volume/HSE | 1 : 708.74 |
| Adhesive weight/Total | 1 : 1.57 |
| Tractive force/Heating surface | 1 : 12.79 |
| Grate area/Heating surface | 1 : 57.43 |
| Firebox/Tube surface | 1 : 9.24 |
| Total/Superheater | 1 : 5.38 |
