| South African Class C1 4-6-2T | |
|---|---|
| NGR Class K&S 25, renumbered 38 SAR Class C1 77 |
|
| Power type | Steam |
| Designer | Kitson and Company Natal Government Railways |
| Builder | Kitson and Company South African Railways |
| Serial number | Kitson 2507, SAR none |
| Model | NGR K&S |
| Build date | 1882, 1912 |
| Total produced | 5 |
| Rebuilder | Natal Government Railways |
| Rebuild date | 1901 |
| Number rebuilt | 1 from 4-6-0T |
| Configuration | 4-6-2T "Pacific" |
| 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 | 21 ft 8.25 in (6.610 m) total 5 ft (1.524 m) pilot 7 ft 9 in (2.362 m) drivers |
| Length | 28 ft 9.75 in (8.782 m) |
| Height | 11 ft 7.5 in (3.543 m) |
| Frame | Plate frame |
| Axle load | 9.2 long tons (9.3 t) on 2nd driver |
| Weight on drivers | 26.45 long tons (26.9 t) |
| Locomotive weight | 38.6 long tons (39.2 t) |
| Fuel type | Coal |
| Fuel capacity | 2.25 long tons (2.3 t) |
| Water capacity | 1,070 imp gal (4,900 l) |
| Boiler | 3 ft 8.125 in (1.121 m) int dia 10 ft 3 in (3.124 m) int length 5 ft 10.5 in (1.791 m) pitch |
| Boiler pressure | 160 psi (1,100 kPa) |
| Firegrate area | 13.8 sq ft (1.282 m2) |
| Heating surface: Tubes |
173 tubes 1.75 in (44.5 mm) dia 818.32 sq ft (76.024 m2) |
| Heating surface: Firebox |
68.26 sq ft (6.342 m2) |
| Heating surface: Total |
886.58 sq ft (82.366 m2) |
| Cylinders | Two |
| Cylinder size | 14 in (356 mm) bore 21 in (533 mm) stroke |
| Valve gear | Stephenson |
| Tractive effort | 12,660 lbf (56.3 kN) at 75% boiler pressure |
| Career | Natal Government Railways South African Railways |
| Class | NGR Class K&S, SAR Class C1 |
| Number in class | NGR 1, SAR 5 |
| Number | NGR 25, renumbered 38 SAR 77, 325-328[1] |
| Delivered | 1882, 1912[2] |
| First run | 1901 |
| Withdrawn | 1931[3] |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 1901 one of them was rebuilt to a 4-6-2T locomotive and in 1912, when it was assimilated into the South African Railways, it was renumbered and reclassified to Class C1. During 1912 four more of these 4-6-2T locomotives were built from surplus material in the Durban workshops.[1][2][3]
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The 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. In 1901 W. Milne, who was appointed as Locomotive Superintendent of the NGR in 1877, rebuilt one of the Kitson batch of 1882, number 25, to a 4-6-2T wheel arrangement. The NGR later renumbered this locomotive to 38, but it remained known as a K&S class 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 38.6 long tons (39.2 tonnes). It had a 5 feet (1.524 metres) longer wheelbase and was 2 feet 9 inches (0.838 metres) longer over the buffers. A larger coal bunker increased its fuel carrying capacity from 1 long ton (1.0 tonne) to 2.25 long tons (2.3 tonnes) and larger water tanks increased its capacity from 700 to 1,070 imperial gallons (3,200 to 4,900 litres). It was also equipped with a larger boiler, with the operating pressure reduced from 175 to 160 pounds per square inch (1,210 to 1,100 kilopascals).[2]
When the three colonial railroads were amalgamated into the South African Railways (SAR) in 1912, this locomotive became the SAR’s Class C1 and was renumbered 77. The rebuilt locomotive ran well and gave such good service that, also in 1912, the SAR built a further four Class C1 locomotives in the Durban workshops, mostly from spare parts and surplus material. These four were numbered 325 to 328.[1][2][3]
The Class C1 was used on branch line work and for shunting at various depots, until it was withdrawn from service in 1931.[3]
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