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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...
| South African class 19ARemove | |
|---|---|
| Variant | as built |
| Built | 1929 |
| Manufacturers | SLM |
| Wheel arrangement | 2D1 |
| Gauge | 1067 mm |
| Length | |
| Service mass | 76356 kg |
| Top speed | |
| Power | |
| Engine |
General
| Property | South African class 19Aas built |
|---|---|
| Built | 1929 |
| Manufacturers | SLM |
| Wheel arrangement | 4-8-2 (Mountain) |
| Gauge | 1,067 mm |
Dimensions and weights
| Property | South African class 19Aas built |
|---|---|
| Wheelbase | 9.80 m |
| Total wheelbase | 17.86 m |
| Service mass | 76.4 t |
| Adhesion mass | 52.5 t |
| Total mass | 128.1 t |
| Rigid wheelbase | 4.39 m |
| Axle load | 13.4 t |
| Water capacity | 19,321 l |
| Fuel capacity | 9.1 t (coal) |
Boiler
| Property | South African class 19Aas 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 19Aas 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 19Aas built |
|---|---|
| Power source | steam |
| Estimated power | 969 kW (1,317 PS) |
| Starting effort | 146.6 kN |
Calculated values
| Property | South African class 19Aas 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 |
