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South African class 19A
Since the axle load of the SAR class 19 was still too high for some branch lines, Col F.R. Collins designed the lighter class 19A. Changes included a smaller boiler, a cylinder diameter of 19.5 instead of 21 inches an...
General
| Property | South African class 19A as built |
|---|---|
| Built | 1929 |
| Manufacturers | SLM |
| Wheel arrangement | 4-8-2 (Mountain) |
| Gauge | 1,067 mm (Cape gauge) |
Dimensions and weights
| Property | South African class 19A as built |
|---|---|
| Wheelbase | 9.80 m |
| Rigid wheelbase | 4.39 m |
| Total wheelbase | 17.86 m |
| Service weight | 76.4 t |
| Adhesive weight | 52.5 t |
| Axle load | 13.4 t |
| Total weight | 128.1 t |
| Water capacity | 19,321 l |
| Fuel capacity | 9.1 t (coal) |
Boiler
| Property | South African class 19A as built |
|---|---|
| Grate area | 3.345 m² |
| Firebox surface | 13.006 m² |
| Tube heating surface | 141.863 m² |
| Evaporative heating surface | 154.87 m² |
| Superheater surface | 38.555 m² |
| Total heating surface | 193.4 m² |
Power plant
| Property | South African class 19A as built |
|---|---|
| Driver diameter | 1,295 mm |
| Boiler pressure | 13.8 bar |
| Expansion type | simple expansion |
| Cylinders | two, 495 x 660 mm |
Power
| Property | South African class 19A as built |
|---|---|
| Power source | steam |
| Estimated power | 969 kW (1,317 PS) |
| Starting effort | 146.6 kN |
Calculated values
| Property | South African class 19A as built |
|---|---|
| Factor of adhesion | 1 : 3.51 |
| Optimal speed | 40 km/h |
| Power-to-weight ratio | 12.7 kW/t |
| Heating Surface Equivalent | 297.0 m² |
| Cylinder volume/HSE | 1 : 856.83 |
| Adhesive weight/Total | 1 : 1.45 |
| Tractive force/Heating surface | 1 : 15.83 |
| Grate area/Heating surface | 1 : 57.83 |
| Firebox/Tube surface | 1 : 10.91 |
| Total/Superheater | 1 : 4.02 |
