Central South African class 10-2
South African classes 10A and 10B
South Africa 1910 15 produced
The CSAR class 10-2 was made up of Pacific tender locomotives which were primarily based on the class 10. In 1910, five locomotives were built without and five with a Schmidt superheater. The result was that the superheated locomotives could haul about 25 percent more. In 1911 five more were built with superheaters and in 1912 the SAR classified the two variants as class 10A and 10B. In the thirties a total of ten were fitted with the standard boiler No. 1 by A.G. Watson and renamed class 10BR. They remained in service until 1974.
Technical data
General
| Property | 10A | 10B | rebuilt 10BR |
|---|---|---|---|
| Built | 1910 | 1910-1911 | |
| Manufacturers | North British | North British, Beyer, Peacock & Co. | |
| Wheel arrangement | 4-6-2 (Pacific) | ||
| Gauge | 1,067 mm (Cape gauge) | ||
Dimensions and weights
| Property | 10A | 10B | rebuilt 10BR |
|---|---|---|---|
| Length | 19.48 m | ||
| Wheelbase | 9.20 m | ||
| Total wheelbase | 16.97 m | ||
| Service mass | 74.9 t | 75.6 t | 77.3 t |
| Adhesion mass | 47.8 t | 48.9 t | |
| Total mass | 125.1 t | 125.8 t | 127.5 t |
| Rigid wheelbase | 3.30 m | ||
| Axle load | 16.2 t | 16 t | 16.7 t |
| Water capacity | 18,185 l | ||
| Fuel capacity | 10.2 t (coal) | ||
Boiler
| Property | 10A | 10B | rebuilt 10BR |
|---|---|---|---|
| Grate area | 3.214 m² | 3.252 m² | 3.345 m² |
| Firebox surface | 11.892 m² | 11.613 m² | 11.427 m² |
| Tube heating surface | 156.263 m² | 135.917 m² | 139.076 m² |
| Evaporative heating surface | 168.155 m² | 147.53 m² | 150.503 m² |
| Total heating surface | 168.2 m² | 183.2 m² | 184.5 m² |
| Superheater surface | 35.675 m² | 34.003 m² |
Power plant
| Property | 10A | 10B | rebuilt 10BR |
|---|---|---|---|
| Driver diameter | 1,575 mm | ||
| Boiler pressure | 13.8 bar | 12.4 bar | |
| Expansion type | simple expansion | ||
| Cylinders | two, 470 x 711 mm | two, 508 x 711 mm | |
Power
| Property | 10A | 10B | rebuilt 10BR |
|---|---|---|---|
| Power source | steam | ||
| Estimated power | 708 kW (963 PS) | 820 kW (1,115 PS) | |
| Starting effort | 116.9 kN | 122.9 kN | |
Calculated values
| Property | 10A | 10B | rebuilt 10BR |
|---|---|---|---|
| Factor of adhesion | 1 : 4.01 | 1 : 3.81 | 1 : 3.90 |
| Optimal speed | 37 km/h | 40 km/h | |
| Power-to-weight ratio | 9.4 kW/t | 10.8 kW/t | 10.6 kW/t |
| Heating Surface Equivalent | 227.6 m² | 276.9 m² | 275.6 m² |
| Cylinder volume/HSE | 1 : 1,083.73 | 1 : 1,040.99 | 1 : 1,045.90 |
| Adhesive weight/Total | 1 : 1.57 | 1 : 1.58 | |
| Tractive force/Heating surface | 1 : 14.52 | 1 : 14.02 | 1 : 13.92 |
| Grate area/Heating surface | 1 : 52.32 | 1 : 56.34 | 1 : 55.16 |
| Firebox/Tube surface | 1 : 13.14 | 1 : 11.70 | 1 : 12.17 |
| Total/Superheater | 1 : 4.14 | 1 : 4.43 | |
