| South African Class C2 4-6-4T | |
|---|---|
| SAR Class C2 86, ex NGR Class K&S 21, renumbered 39, as depicted on a SAR Museum playing card | |
| Power type | Steam |
| Designer | Kitson and Company |
| Builder | Robert Stephenson and Company |
| Serial number | 2487 |
| Model | NGR K&S |
| Build date | 1882 |
| Total produced | 37 |
| Rebuilder | Natal Government Railways |
| Rebuild date | 1896 |
| Number rebuilt | 1 from 4-6-0T |
| Configuration | 4-6-4T "Hudson" |
| Gauge | 3 ft 6 in (1,067 mm) Cape gauge |
| Leading wheel diameter |
25.75 in (654 mm) |
| Driver diameter | 39 in (991 mm) |
| Trailing wheel diameter |
25.75 in (654 mm) |
| Wheelbase | 25 ft 7.25 in (7.804 m) total 5 ft (1.524 m) pilot 7 ft 9 in (2.362 m) drivers 5 ft (1.524 m) trailing |
| Length | 31 ft 5.25 in (9.582 m) |
| Height | 11 ft 7.5 in (3.543 m) |
| Frame | Plate frame |
| Axle load | 7.75 long tons (7.9 t) on 2nd driver |
| Weight on drivers | 21.95 long tons (22.3 t) |
| Locomotive weight | 33.1 long tons (33.6 t) |
| Fuel type | Coal |
| Fuel capacity | 2 long tons (2.0 t) |
| Water capacity | 1,130 imp gal (5,100 l) |
| Boiler | 3 ft 2.825 in (0.986 m) int dia 10 ft 3.5 in (3.137 m) int length 5 ft 7 in (1.702 m) pitch |
| Boiler pressure | 145 psi (1,000 kPa) |
| Firegrate area | 11 sq ft (1.022 m2) |
| Heating surface: Tubes |
130 tubes 1.75 in (44.5 mm) dia 611 sq ft (56.764 m2) |
| Heating surface: Firebox |
58 sq ft (5.388 m2) |
| Heating surface: Total |
669 sq ft (62.152 m2) |
| Cylinders | Two |
| Cylinder size | 14 in (356 mm) bore 21 in (533 mm) stroke |
| Valve gear | Stephenson |
| Tractive effort | 11,480 lbf (51.1 kN) at 75% boiler pressure |
| Career | Natal Government Railways South African Railways |
| Class | NGR Class K&S, SAR Class C2 |
| Number in class | 1 |
| Number | NGR 21, renumbered 39 SAR 86[1] |
| Delivered | 1882[2] |
| First run | 1896 |
| Withdrawn | 1931[3] |
| Disposition | Retired |
Between 1879 and 1885 the Natal Government Railways placed thirty-seven 4-6-0T tank steam locomotives in service. In 1896 one of them was rebuilt to a 4-6-4T locomotive and in 1912, when it was assimilated into the South African Railways, this locomotive was renumbered and reclassified to the sole Class C2.[1][2][3]
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The Natal Government Railways (NGR) Class K&S 4-6-0T tank locomotives, so named after their builders, Kitson and Company and Robert Stephenson and Company, were delivered between 1879 and 1884. They had plate frames and used Stephenson valve gear.[2][3]
In 1896 W. Milne, who was appointed as Locomotive Superintendent of the NGR in 1877, rebuilt one of the Stephenson batch of 1882, number 21, to a 4-6-4T wheel arrangement for use in shuttle service on the South Coast line. At the time there were no turntables available on this line and the modification was made to enable the locomotive to run equally well in either direction. The NGR later renumbered this locomotive to 39, but it remained known as a K&S type in NGR service.[2][3]
The rebuilding resulted in a heavier locomotive, with its weight increased from 29.1 long tons (29.6 tonnes) to 33.1 long tons (33.6 tonnes). It had an 8 feet 11 inches (2.718 metres) longer wheelbase and was 5 feet 4.5 inches (1.638 metres) longer over the buffers. A larger coal bunker increased its fuel carrying capacity from 1 long ton (1.0 tonne) to 2 long tons (2.0 tonnes) and larger water tanks increased its capacity from 700 to 1,130 imperial gallons (3,200 to 5,100 litres). The operating pressure of its boiler was reduced from 175 to 145 pounds per square inch (1,210 to 1,000 kilopascals).[2]
When the various colonial railroads were amalgamated into the South African Railways (SAR) in 1912, this locomotive became the SAR’s Class C2 and was renumbered 86.[1][2][3]
The Class C2 was used on branch line work and for shunting until it was withdrawn from service in 1931.[3]
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