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Cape Government Railways class 7 (1896)
The second type of Class 7 4-8-0 locomotives procured by the Cape Government Railways was built from 1896 for the central and eastern regions. They all came from British manufacturers and 45 were delivered by 1898, wh...
General
| Property | Cape Government Railways class 7 (1896) superheated |
|---|---|
| Built | 1896-1898, 1901 |
| Manufacturers | Sharp, Stewart & Co., Dübs & Co., Neilson & Co. |
| Wheel arrangement | 4-8-0 (Twelve-wheeler) |
| Gauge | 1,067 mm (Cape gauge) |
Dimensions and weights
| Property | Cape Government Railways class 7 (1896) superheated |
|---|---|
| Length | 16.29 m |
| Wheelbase | 6.49 m |
| Rigid wheelbase | 3.66 m |
| Total wheelbase | 14.07 m |
| Service weight | 49.9 t |
| Adhesive weight | 38.4 t |
| Axle load | 9.9 t |
| Total weight | 84.5 t |
| Water capacity | 11,818 l |
| Fuel capacity | 5.6 t (coal) |
Boiler
| Property | Cape Government Railways class 7 (1896) superheated |
|---|---|
| Grate area | 1.672 m² |
| Firebox surface | 10.498 m² |
| Tube heating surface | 74.88 m² |
| Evaporative heating surface | 85.378 m² |
| Superheater surface | 19.138 m² |
| Total heating surface | 104.5 m² |
Power plant
| Property | Cape Government Railways class 7 (1896) superheated |
|---|---|
| Driver diameter | 1,086 mm |
| Boiler pressure | 12.4 bar |
| Expansion type | simple expansion |
| Cylinders | two, 432 x 584 mm |
Power
| Property | Cape Government Railways class 7 (1896) superheated |
|---|---|
| Power source | steam |
| Estimated power | 522 kW (710 PS) |
| Starting effort | 105.8 kN |
Calculated values
| Property | Cape Government Railways class 7 (1896) superheated |
|---|---|
| Factor of adhesion | 1 : 3.56 |
| Optimal speed | 31 km/h |
| Power-to-weight ratio | 10.5 kW/t |
| Heating Surface Equivalent | 176.1 m² |
| Cylinder volume/HSE | 1 : 971.36 |
| Adhesive weight/Total | 1 : 1.30 |
| Tractive force/Heating surface | 1 : 21.15 |
| Grate area/Heating surface | 1 : 62.51 |
| Firebox/Tube surface | 1 : 7.13 |
| Total/Superheater | 1 : 4.46 |
