| South African Class Exp 4 2-8-2 | |
|---|---|
| CGR Class 9 806, circa 1911 SAR Class Experimental 4 911 |
|
| Power type | Steam |
| Designer | Cape Government Railways |
| Builder | Kitson and Company |
| Serial number | 4195-4196[1] |
| Model | CGR Class 9[2][3] |
| Build date | 1903 |
| Total produced | 2 |
| Configuration | 2-8-2 "Mikado" |
| Gauge | 3 ft 6 in (1,067 mm) Cape gauge |
| Leading wheel diameter |
28.5 in (724 mm) |
| Driver diameter | 48 in (1,220 mm) |
| Trailing wheel diameter |
33 in (838 mm) |
| Wheelbase | Total: 50 ft 7.25 in (15.424 m) Engine: 13 ft 1 in (3.988 m) coupled 26 ft 9 in (8.153 m) total Tender: 4 ft 7 in (1.397 m) bogie 14 ft 7 in (4.445 m) total |
| Height | 12 ft 10 in (3.912 m) |
| Frame | Bar frame |
| Axle load | 12.8 long tons (13.0 t) on 4th driver |
| Weight on drivers | 48.9 long tons (49.7 t) |
| Locomotive weight | 64.35 long tons (65.4 t) |
| Tender weight | 36.9 long tons (37.5 t) |
| Locomotive & tender combined weight |
101.25 long tons (102.9 t) |
| Tender type | 2 axle bogies Wheels 34 in (864 mm) dia |
| Fuel type | Coal |
| Fuel capacity | 6 long tons (6.1 t) |
| Water capacity | 2,855 imp gal (12,980 l) |
| Boiler | 4 ft 10.75 in (1.492 m) int dia 14 ft 10.125 in (4.524 m) int length 7 ft 1 in (2.159 m) pitch |
| Boiler pressure | 180 psi (1,240 kPa) |
| Firegrate area | 26.75 sq ft (2.485 m2) |
| Heating surface: Tubes |
159 tubes 2.25 in (57.2 mm) ext dia 1,391 sq ft (129.228 m2) |
| Heating surface: Firebox |
117.3 sq ft (10.898 m2) |
| Heating surface: Total |
1,508.3 sq ft (140.126 m2) |
| Cylinders | Two |
| Cylinder size | 19 in (483 mm) bore 24 in (610 mm) stroke |
| Valve gear | Stephenson |
| Tractive effort | 24,370 lbf (108.4 kN) at 75% boiler pressure[1] |
| Career | Cape Government Railways South African Railways |
| Class | CGR Class 9 SAR Class Exp 4[2][3] |
| Number in class | 2 |
| Number | CGR 805-806, SAR 910-911[2][3] |
| Delivered | 1903 |
| First run | 1903 |
| Withdrawn | 1930 |
| Disposition | Retired |
In 1903 the Cape Government Railways placed two Class 9 steam locomotives with a 2-8-2 Mikado wheel arrangement in service. In 1912, when these locomotives were assimilated into the South African Railways, they were renumbered and classified as Class Experimental 4.[1][2][4]
Contents |
The Cape Class 9 locomotive was designed by H.M. Beatty, the Locomotive Superintendent of the Cape Government Railways (CGR) from 1896 to 1910. They were the first South African locomotives to have a 2-8-2 Mikado wheel arrangement and they were built with bar frames, had Stephenson’s link motion valve gear and used saturated steam. Two locomotives were delivered by Kitson and Company in 1903, numbered 805 and 806.[1][2][4]
With these locomotives, Beatty attempted to combine the best design features and good qualities of his Cape Class 8 2-8-0 locomotive of 1901 with the improved steaming that was obtained from a wide firegrate. In many respects they were enlarged versions of the two Cape Class 6 2-6-2 locomotives that were delivered by Kitson in that same year, with many features in common.[1]
In comparison with the Cape Class 8, however, it was found that their maintenance costs were much heavier, without any advantage in terms of efficiency. As a result, no more of the type were ordered.[1][4]
They were placed in service on the main line between De Aar and Kimberley. In 1912, when the two locomotives were assimilated into the South African Railways (SAR), they were reclassified as Class Experimental 4 and renumbered to 910 and 911. They were withdrawn from service and scrapped in 1930.[1][2][4]
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