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South African class 5 “Enlarged Karoo”
Based on the 4-6-2 Karoo class locomotives, the Cape Government Railways ordered four “Enlarged Karoo” locomotives also designed by H.M. Beatty shortly before the founding of the South African Railways. In comparison ...
General
| Property | South African class 5 “Enlarged Karoo” rebuilt 5R |
|---|---|
| Built | 1935 |
| Manufacturers | SAR |
| Wheel arrangement | 4-6-2 (Pacific) |
| Gauge | 1,067 mm (Cape gauge) |
Dimensions and weights
| Property | South African class 5 “Enlarged Karoo” rebuilt 5R |
|---|---|
| Length | 19.56 m |
| Wheelbase | 8.97 m |
| Rigid wheelbase | 3.25 m |
| Total wheelbase | 17.02 m |
| Service weight | 73.6 t |
| Adhesive weight | 47.7 t |
| Axle load | 16.7 t |
| Total weight | 123.8 t |
| Water capacity | 18,185 l |
| Fuel capacity | 10.2 t (coal) |
Boiler
| Property | South African class 5 “Enlarged Karoo” rebuilt 5R |
|---|---|
| Grate area | 3.345 m² |
| Firebox surface | 11.427 m² |
| Tube heating surface | 139.076 m² |
| Evaporative heating surface | 150.503 m² |
| Superheater surface | 34.003 m² |
| Total heating surface | 184.5 m² |
Power plant
| Property | South African class 5 “Enlarged Karoo” rebuilt 5R |
|---|---|
| Driver diameter | 1,575 mm |
| Boiler pressure | 13.1 bar |
| Expansion type | simple expansion |
| Cylinders | two, 508 x 711 mm |
Power
| Property | South African class 5 “Enlarged Karoo” rebuilt 5R |
|---|---|
| Power source | steam |
| Estimated power | 858 kW (1,167 PS) |
| Starting effort | 129.8 kN |
Calculated values
| Property | South African class 5 “Enlarged Karoo” rebuilt 5R |
|---|---|
| Factor of adhesion | 1 : 3.61 |
| Optimal speed | 40 km/h |
| Power-to-weight ratio | 11.7 kW/t |
| Heating Surface Equivalent | 275.6 m² |
| Cylinder volume/HSE | 1 : 1,045.90 |
| Adhesive weight/Total | 1 : 1.54 |
| Tractive force/Heating surface | 1 : 14.69 |
| Grate area/Heating surface | 1 : 55.16 |
| Firebox/Tube surface | 1 : 12.17 |
| Total/Superheater | 1 : 4.43 |
