South African Class 9 4-6-2
CSAR no. 600, SAR no. 727, c. 1904
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| The 2nd coupled axle had flangeless wheels | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Type and origin | |
|---|---|
| Power type | Steam |
| Designer |
Central South African Railways (P.A. Hyde) |
| Builder | Vulcan Foundry |
| Serial number | 1904-1907, 1985 |
| Model | CSAR Class 9 |
| Build date | 1904 |
| Total produced | 5 |
| Specifications | |
|---|---|
| Configuration | 4-6-2 (Pacific) |
| Driver | 2nd coupled axle |
| Gauge | 3 ft 6 in (1,067 mm) Cape gauge |
| Leading dia. | 30 in (762 mm) |
| Coupled dia. | 57 in (1,448 mm) |
| Trailing dia. | 30 in (762 mm) |
| Tender wheels |
33 1⁄2 in (851 mm) as built 34 in (864 mm) retyred |
| Wheelbase | 52 ft 5⁄8 in (15,865 mm) |
| • Engine | 27 ft 8 1⁄2 in (8,446 mm) |
| • Leading | 6 ft 4 in (1,930 mm) |
| • Coupled | 11 ft (3,353 mm) |
| • Tender | 17 ft 3⁄8 in (5,191 mm) |
| • Tender bogie | 4 ft 7 in (1,397 mm) |
| Wheel spacing (Asymmetrical) |
1-2: 5 ft 3 in (1,600 mm) 2-3: 5 ft 9 in (1,753 mm) |
| Length: |
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| • Over couplers | 59 ft 10 3⁄4 in (18,256 mm) |
| Height | 12 ft 10 in (3,912 mm) |
| Frame type | Bar |
| Axle load | 13 LT 1 cwt (13,260 kg) |
| • Leading | 13 LT 16 cwt 2 qtr (14,050 kg) |
| • 1st coupled | 13 LT 0 cwt 2 qtr (13,230 kg) |
| • 2nd coupled | 13 LT 1 cwt (13,260 kg) |
| • 3rd coupled | 12 LT 19 cwt (13,160 kg) |
| • Trailing | 7 LT 10 cwt 3 qtr (7,658 kg) |
| • Tender bogie | 23 LT 15 cwt (24,130 kg) each |
| • Tender axle | 11 LT 17 cwt 2 qtr (12,070 kg) |
| Adhesive weight | 39 LT 0 cwt 2 qtr (39,650 kg) |
| Loco weight | 60 LT 7 cwt 3 qtr (61,360 kg) |
| Tender weight | 47 LT 10 cwt (48,260 kg) |
| Total weight | 107 LT 17 cwt 3 qtr (109,600 kg) |
| Tender type | XM3 (2-axle bogies) |
| Fuel type | Coal |
| Fuel capacity | 10 LT (10.2 t) |
| Water cap | 4,000 imp gal (18,200 l) |
| Firebox type | Round-top |
| • Firegrate area | 21.75 sq ft (2.021 m2) |
| Boiler: |
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| • Pitch | 7 ft 3 in (2,210 mm) |
| • Diameter | 5 ft (1,524 mm) |
| • Tube plates | 12 ft 7 in (3,835 mm) |
| • Small tubes | 205: 2 in (51 mm) |
| Boiler pressure | 200 psi (1,379 kPa) |
| Safety valve | Ramsbottom |
| Heating surface | 1,481 sq ft (137.6 m2) |
| • Tubes | 1,350 sq ft (125 m2) |
| • Firebox | 131 sq ft (12.2 m2) |
| Cylinders | Two |
| Cylinder size | 18 in (457 mm) bore 26 in (660 mm) stroke |
| Valve gear | Stephenson |
| Valve type | Balanced slide |
| Couplers | Johnston link-and-pin |
| Performance figures | |
|---|---|
| Tractive effort | 22,170 lbf (98.6 kN) @ 75% |
| Career | |
|---|---|
| Operators | Central South African Railways South African Railways |
| Class | CSAR & SAR Class 9 |
| Number in class | 5 |
| Numbers | CSAR 600-604, SAR 727-731 |
| Delivered | 1904 |
| First run | 1904 |
| Withdrawn | 1926 |
The South African Railways Class 9 4-6-2 of 1904 was a steam locomotive from the pre-Union era in Transvaal Colony.
In 1904, the Central South African Railways placed five Class 9 steam locomotives with a 4-6-2 Pacific type wheel arrangement in service. In 1912, when they were assimilated into the South African Railways, they were renumbered but retained their Class 9 designation.
Upon its establishment in 1902 at the end of the Second Boer War, the Central South African Railways (CSAR) inherited a variety of locomotive types from the Imperial Military Railways (IMR), which had been established by the British military during the war through the absorption of the separate state and other railways of the Zuid-Afrikaansche Republiek (ZAR) and the Oranje-Vrijstaat as possession was obtained of the territories of these two republics.
The larger two of these constituent railways were the Nederlandsche-Zuid-Afrikaansche Spoorweg-Maatschappij (NZASM), which operated between Pretoria, capital of the ZAR, and Lourenço Marques, capital of the Portuguese colony of Moçambique, and the Oranje-Vrijstaat Gouwerment-Spoorwegen (OVGS). Smaller constituents were the Pretoria-Pietersburg Railway (PPR) and the Selati Railway.
Of the mixed amalgam of locomotives which were inherited from these railways, the best was probably the 8th Class 4-8-0, designed by H.M. Beatty of the Cape Government Railways (CGR). These locomotives were brand new, having been acquired by the IMR shortly before the end of the war, and featured a bar frame, narrow firebox and cylinders with overhead slide valves actuated by Stephenson valve gear.
While the Orange Free State obtained their locomotives second-hand from the CGR or directly from the manufacturers used by the CGR, the mainly German suppliers of railway equipment to the old NZASM underestimated the requirements of a railway that would extend over 291 miles (468 kilometres) from Komatipoort at the border with Mozambique to Pretoria and rise 6,000 ft (1,829 m) in the process. Apart from the various smaller tank locomotives, they supplied the NZASM with 46 Tonner 0-6-4 tank engines with an adhesive weight of 32 tons and a tractive effort of 16,580 pounds-force (73.8 kilonewtons) to work a mainline.
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