Natal Government Railways class G
South African class C
South Africa 1879 37 produced
Shortly after the changeover to cape gauge, the NGR ordered seven tank locomotives with a 2-6-0T wheel arrangement. They were quickly converted to the 4-6-0T wheel arrangement and all 30 others were built with this wheel arrangement ex works. Some of them were used with additional water tenders to increase the range. Two were converted by Reid to 4-6-4T and one to 4-6-2T. When the SAR was founded, there were still twelve locomotives which became class C. One of the locomotives built in 1879 was sold to a power plant company and reached a service life of more than 100 years before it was declared a museum piece.
Technical data
General
| Property | 2-6-0T | 4-6-0T |
|---|---|---|
| Built | 1879-1883 | 1883-1885 |
| Manufacturers | Kitson & Co. | Kitson & Co., Robert Stephenson & Co. |
| Wheel arrangement | 2-6-0T (Mogul) | 4-6-0T (Ten-wheeler) |
| Gauge | 1,067 mm (Cape gauge) | |
Dimensions and weights
| Property | 2-6-0T | 4-6-0T |
|---|---|---|
| Length | 7.32 m | 7.94 m |
| Wheelbase | 4.29 m | 5.09 m |
| Rigid wheelbase | 2.36 m | |
| Water capacity | 3,184 l | |
| Fuel capacity | 1.3 t (coal) | 1 t (coal) |
| Service mass | 29.6 t | |
| Adhesion mass | 23.6 t | |
| Axle load | 8.3 t | |
Boiler
| Property | 2-6-0T | 4-6-0T |
|---|---|---|
| Grate area | 1.022 m² | |
| Firebox surface | 5.388 m² | |
| Tube heating surface | 56.764 m² | |
| Evaporative heating surface | 62.152 m² | |
| Total heating surface | 62.2 m² | |
Power plant
| Property | 2-6-0T | 4-6-0T |
|---|---|---|
| Driver diameter | 965 mm | 991 mm |
| Boiler pressure | 9.7 bar | 12.1 bar |
| Expansion type | simple expansion | |
| Cylinders | two, 356 x 533 mm | |
Power
| Property | 2-6-0T | 4-6-0T |
|---|---|---|
| Power source | steam | |
| Estimated power | 149 kW (203 PS) | |
| Starting effort | 57.3 kN | 69.8 kN |
Calculated values
| Property | 2-6-0T | 4-6-0T |
|---|---|---|
| Optimal speed | 16 km/h | 13 km/h |
| Heating Surface Equivalent | 89.1 m² | |
| Cylinder volume/HSE | 1 : 1,189.21 | |
| Tractive force/Heating surface | 1 : 19.27 | 1 : 23.47 |
| Grate area/Heating surface | 1 : 60.81 | |
| Firebox/Tube surface | 1 : 10.54 | |
| Factor of adhesion | 1 : 3.31 | |
| Power-to-weight ratio | 5.0 kW/t | |
| Adhesive weight/Total | 1 : 1.25 | |
