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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 rebuilt 19AR |
|---|---|
| Built | 1935 |
| Manufacturers | SLM |
| Wheel arrangement | 4-8-2 (Mountain) |
| Gauge | 1,067 mm (Cape gauge) |
Dimensions and weights
| Property | South African class 19A rebuilt 19AR |
|---|---|
| Wheelbase | 9.80 m |
| Rigid wheelbase | 4.39 m |
| Total wheelbase | 17.86 m |
| Service weight | 77.3 t |
| Adhesive weight | 52 t |
| Axle load | 13 t |
| Total weight | 129.1 t |
| Water capacity | 19,321 l |
| Fuel capacity | 9.1 t (coal) |
Boiler
| Property | South African class 19A rebuilt 19AR |
|---|---|
| Grate area | 3.345 m² |
| Firebox surface | 12.914 m² |
| Tube heating surface | 157.935 m² |
| Evaporative heating surface | 170.849 m² |
| Superheater surface | 37.533 m² |
| Total heating surface | 208.4 m² |
Power plant
| Property | South African class 19A rebuilt 19AR |
|---|---|
| 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 rebuilt 19AR |
|---|---|
| Power source | steam |
| Estimated power | 969 kW (1,317 PS) |
| Starting effort | 146.6 kN |
Calculated values
| Property | South African class 19A rebuilt 19AR |
|---|---|
| Factor of adhesion | 1 : 3.48 |
| Optimal speed | 40 km/h |
| Power-to-weight ratio | 12.5 kW/t |
| Heating Surface Equivalent | 310.5 m² |
| Cylinder volume/HSE | 1 : 819.64 |
| Adhesive weight/Total | 1 : 1.49 |
| Tractive force/Heating surface | 1 : 14.69 |
| Grate area/Heating surface | 1 : 62.30 |
| Firebox/Tube surface | 1 : 12.23 |
| Total/Superheater | 1 : 4.55 |
