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South African class 15F
The class 15F was the most numerous steam locomotive class of the SAR. Introduced in 1938 under Chief Mechanical Engineer W.A.J. Day, it represented the final development of the class 15 family of 4-8-2 locomotives th...
General
| Property | South African class 15F last batch with EW tender |
|---|---|
| Built | 1946-1947 |
| Manufacturers | North British |
| Wheel arrangement | 4-8-2 (Mountain) |
| Gauge | 1,067 mm (Cape gauge) |
Dimensions and weights
| Property | South African class 15F last batch with EW tender |
|---|---|
| Wheelbase | 10.87 m |
| Rigid wheelbase | 4.80 m |
| Service weight | 115.1 t |
| Adhesive weight | 76.2 t |
| Axle load | 19.1 t |
| Total weight | 224.5 t |
| Water capacity | 43,188 l |
| Fuel capacity | 18.3 t (coal) |
Boiler
| Property | South African class 15F last batch with EW tender |
|---|---|
| Grate area | 5.806 m² |
| Firebox surface | 21.554 m² |
| Tube heating surface | 295.339 m² |
| Evaporative heating surface | 316.893 m² |
| Superheater surface | 61.409 m² |
| Total heating surface | 378.3 m² |
Power plant
| Property | South African class 15F last batch with EW tender |
|---|---|
| Driver diameter | 1,524 mm |
| Boiler pressure | 14.5 bar |
| Expansion type | simple expansion |
| Cylinders | two, 610 x 711 mm |
Power
| Property | South African class 15F last batch with EW tender |
|---|---|
| Power source | steam |
| Estimated power | 1,864 kW (2,534 PS) |
| Starting effort | 213.4 kN |
Calculated values
| Property | South African class 15F last batch with EW tender |
|---|---|
| Factor of adhesion | 1 : 3.50 |
| Optimal speed | 53 km/h |
| Power-to-weight ratio | 16.2 kW/t |
| Heating Surface Equivalent | 547.5 m² |
| Cylinder volume/HSE | 1 : 758.29 |
| Adhesive weight/Total | 1 : 1.51 |
| Tractive force/Heating surface | 1 : 11.78 |
| Grate area/Heating surface | 1 : 65.16 |
| Firebox/Tube surface | 1 : 13.70 |
| Total/Superheater | 1 : 5.16 |
