South African Class 4 4-8-2
28+1⁄2 in (724 mm)
34 in (864 mm) retyred
(Asymmetrical)
2-3: 4 ft 9 in (1,448 mm)
3-4: 4 ft 10 in (1,473 mm)
Bogie 2: 21 LT 18 cwt (22,250 kg)
Cole's Pop (No. 851/1478)
28 in (711 mm) stroke
Performance figures | |
---|---|
Tractive effort | 29,420 lbf (130.9 kN) @ 75% |
Career | |
---|---|
Operators | Cape Government Railways South African Railways |
Class | SAR Class 4 |
Number in class | 2 |
Numbers | CGR 850-851 SAR 1477-1478 |
Delivered | 1911 |
First run | 1911 |
Withdrawn | 1938 |
The South African Railways Class 4 4-8-2 of 1911 was a steam locomotive from the pre-Union era in the Cape of Good Hope.
In 1911, the Cape Government Railways placed two steam locomotives with a 4-8-2 Mountain type wheel arrangement in service. They were renumbered and designated Class 4 when they were assimilated into the South African Railways a year later.[1][2][3][4]
Manufacturer
The first 4-8-2 Mountain type locomotive of the Cape Government Railways (CGR) was designed as a heavy mixed traffic engine at the Salt River shops by H.M. Beatty, the Chief Locomotive Superintendent of the CGR from 1896 to 1910. Two locomotives were built by the North British Locomotive Company (NBL) and delivered in March 1911.[1][4][5]
Characteristics
The locomotives were a further development of the two experimental locomotives which had been placed in service by the CGR in 1906, the CGR Class 9 2-8-2 (SAR Class Experimental 5) and the CGR Class 10 4-8-0 (SAR Class Experimental 6), both built by Kitson and Company.[1][4][5]
The Class 4 locomotives had 4+1⁄2 inches (114 millimetres) thick bar frames, Stephenson valve gear with flat "D" slide valves arranged above the cylinders, and used saturated steam. The boiler was equipped with a combustion chamber which was carried forward 2 feet (610 millimetres) from the firebox into the boiler barrel, of which the diameter was increased at the hind course to suit. This reduced the distance between the tube plates to 18 feet (5,486 millimetres) and made them excellent steamers.[1][2][4]
They were numbered 850 and 851 in the CGR numbering sequence, but were not designated a classification. The two engines were not identical, no. 850 being equipped with the usual Ramsbottom safety valves while no. 851 had Cole’s muffled type Pop safety valves, both set to open at 180 pounds per square inch (1,241 kilopascals) boiler pressure. They were delivered with Type XJ tenders with a 6 long tons 10 hundredweight (6.6 tonnes) coal and a 3,500 imperial gallons (15,900 litres) water capacity.[2][4][6][7]
South African Railways
When the Union of South Africa was established on 31 May 1910, the three Colonial government railways (CGR, Natal Government Railways and Central South African Railways) were united under a single administration to control and administer the railways, ports and harbours of the Union. Although the South African Railways and Harbours came into existence in 1910, with Sir William Hoy appointed as its first General Manager, the actual classification and renumbering of all the rolling stock of the three constituent railways were only implemented with effect from 1 January 1912.[3][8]
In 1912, these two locomotives were renumbered to 1477 and 1478 and designated Class 4 on the SAR.[3][4][6]
Service
Both locomotives were placed in service in the Karoo, working between Touws River and Beaufort West. In their later years they were stationed at Worcester, from where they were used extensively on and around the Cape Western system’s mainline, working pick-up goods trains to De Doorns in the Hex River valley and on the Mosselbaai line via Robertson.[1][4]
They were withdrawn from service by 1938.[4]
Illustration
The main picture shows SAR no. 1478 at Worcester, c. 1930, with Cole's Pop safety valves.
- GCR no. 850, SAR no. 1477, with Ramsbottom safety valves
References
- ^ a b c d e Holland, D. F. (1972). Steam Locomotives of the South African Railways. Vol. 2: 1910-1955 (1st ed.). Newton Abbott, England: David & Charles. pp. 12–13, 137. ISBN 978-0-7153-5427-8.
- ^ a b c Espitalier, T.J.; Day, W.A.J. (1945). The Locomotive in South Africa - A Brief History of Railway Development. Chapter VII - South African Railways. South African Railways and Harbours Magazine, April 1945. p. 275.
- ^ a b c Classification of S.A.R. Engines with Renumbering Lists, issued by the Chief Mechanical Engineer’s Office, Pretoria, January 1912, pp. 8, 12, 15, 46 (Reprinted in April 1987 by SATS Museum, R.3125-6/9/11-1000)
- ^ a b c d e f g h Paxton, Leith; Bourne, David (1985). Locomotives of the South African Railways (1st ed.). Cape Town: Struik. pp. 38–39. ISBN 0869772112.
- ^ a b Durrant, AE (1989). Twilight of South African Steam (1st ed.). Newton Abbott: David & Charles. p. 13. ISBN 0715386387.
- ^ a b Holland, D.F. (1971). Steam Locomotives of the South African Railways. Vol. 1: 1859–1910 (1st ed.). Newton Abbott, England: David & Charles. pp. 72–75. ISBN 978-0-7153-5382-0.
- ^ North British Locomotive Company works list, compiled by Austrian locomotive historian Bernhard Schmeiser
- ^ The South African Railways - Historical Survey. Editor George Hart, Publisher Bill Hart, Sponsored by Dorbyl Ltd., Published c. 1978, p. 25.
- v
- t
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- CGR 0-4-0ST Aid
- CGR 0-4-0ST 1873
- CGR 0-4-0ST 1874
- CGR 0-4-0ST 1881
- CGR 0-4-0ST 1881 Coffee Pot
- CGR 0-6-0ST
- CGR 0-6-0T
- CGR 2-6-0ST 1900
- CGR 2-6-0ST 1902
- CGR 1st Class 0-4-0ST 1875
- CGR 1st Class 0-4-0ST 1876
- CGR 1st Class 2-6-0 1876 BP
- CGR 1st Class 2-6-0 1876 Kitson
- CGR 1st Class 2-6-0 1879
- CGR 1st Class 2-6-0 1891
- CGR 1st Class 2-6-0ST
- CGR 1st Class 4-4-0
- CGR 1st Class 4-4-0T
- CGR 1st Class 4-4-0TT
- CGR 2nd Class 2-6-2TT
- CGR 2nd Class 4-4-0T
- CGR 3rd Class 2-6-0T
- CGR 3rd Class 4-4-0 1883
- CGR 3rd Class 4-4-0 1884
- CGR 3rd Class 4-4-0 1889
- CGR 3rd Class 4-4-0 1898
- CGR 3rd Class 4-4-0 1901
- CGR 3rd Class 4-4-0 1903
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- CGR 4th Class 4-6-0TT 1882
- CGR 4th Class 4-6-0TT 1882 Joy
- CGR 4th Class 4-6-0TT 1884
- CGR 5th Class 1890
- CGR 5th Class 1891
- CGR 6th Class 1893
- CGR 6th Class 1896
- CGR 6th Class 1897
- CGR 6th Class 1898
- CGR 6th Class 1900
- CGR 6th Class 1901 Baldwin
- CGR 6th Class 1901 Schenectady
- CGR 6th Class 1901 Neilson's
- CGR 6th Class 1902
- CGR 6th Class 1904
- CGR 6th Class 2-6-2
- CGR 6th Class 2-6-4
- CGR 7th Class 1892
- CGR 7th Class 1896
- CGR 7th Class 1902
- CGR 8th Class 1901
- CGR 8th Class 1902
- CGR 8th Class 2-8-0 1903
- CGR 8th Class 4-8-0 1903
- CGR 8th Class 4-8-0 1903 Exp
- CGR 8th Class 2-8-0 1904
- CGR 8th Class 4-8-0 1904
- CGR 9th Class 1903
- CGR 9th Class 1906
- CGR 10th Class
- CGR Fairlie
- CGR Karoo 1903
- CGR Karoo 1904
- CGR Karoo Compound
- CGR Kitson-Meyer
- CGR Mountain 4-8-2
- CGR Railmotor
- CGR Tandem Compound 1902
- CGR Tandem Compound 1903
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- Cape Copper Britannia
- Cape Copper Caledonia
- Cape Copper Clara
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