South African Class 10D 4-6-2

CSAR Class 10 4-6-2 1910
South African Class 10D 4-6-2

CSAR no. 1002 (SAR no. 779), c. 1910
Type and origin
Power type Steam
Designer Central South African Railways
Builder American Locomotive Company
Serial number 46715
Model CSAR Class 10
Build date 1910
Total produced 1
Specifications
Configuration 4-6-2 "Pacific"
Gauge 3 ft 6 in (1,067 mm) Cape gauge
Leading dia 28.5 in (724 mm)
Driver diameter 62 in (1,575 mm)
Trailing dia 33 in (838 mm)
Wheelbase Total: 55 ft (16,764 mm)
Engine:
6 ft (1,829 mm) bogie
11 ft 2 in (3,404 mm) coupled
29 ft 8 in (9,042 mm) total
Tender:
5 ft 4 in (1,626 mm) bogie
16 ft 8 in (5,080 mm) total
Length 62 ft 7 in (19,075 mm)
Height 12 ft 9.4375 in (3,897 mm)
Frame Bar frame
Axle load 16.5 long tons (16.8 t) on 2nd driver
Adhesive weight 48.65 long tons (49.4 t)
Loco weight 72 long tons (73.2 t)
Tender weight 46.65 long tons (47.4 t) w/o
Loco & tender weight 118.65 long tons (120.6 t) w/o
Tender type 2 axle bogies
33.5 in (851 mm) wheels
Fuel type Coal
Fuel capacity 10 long tons (10.2 t)
Water cap 4,000 imp gal (18,000 l)
Firebox:
  Firegrate area
35 sq ft (3.252 m2)
Boiler 5 ft 0.75 in (1,543 mm) inside diameter
18 ft .375 in (5,496 mm) inside length
7 ft 8 in (2,337 mm) pitch
Boiler pressure 170 psi (1,170 kPa)
Heating surface 1,981 sq ft (184.041 m2)
  Tubes 132 tubes 2.25 in (57 mm) diameter
18 tubes 5.25 in (133 mm) diameter
1,848 sq ft (171.685 m2)
  Firebox 133 sq ft (12.356 m2)
Superheater Fire tubes with side steam headers
  Heating area 363 sq ft (33.724 m2)
Cylinders Two
Cylinder size 21 in (533 mm) bore
28 in (711 mm) stroke
Valve gear Walschaerts
Valve travel 5 12 in (140 mm)
Valve lap 1 in (25 mm)
Valve lead 14 in (6 mm)
Performance figures
Tractive effort 25,390 lbf (113 kN) at 75% pressure
Career
Operators Central South African Railways
South African Railways
Class CSAR Class 10, SAR Class 10D
Number in class 1
Numbers CSAR 1002, SAR 779
Delivered 1910
First run 1910
Retired 1931

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The South African Railways Class 10D 4-6-2 of 1910 is a steam locomotive from the pre-Union era in the Transvaal.

In 1910 the Central South African Railways placed one American-built Class 10 4-6-2 Pacific type steam locomotive in service. When the South African Railways was established in 1912, this locomotive was renumbered and reclassified to the sole Class 10D.[1][2][3]

Manufacturer

One 4-6-2 Pacific type passenger locomotive was ordered by the Central South African Railways (CSAR) from the American Locomotive Company (ALCO) in 1910. It was built to very much the same specifications as that of the CSAR Class 10-2 of that same year, designed by CSAR Chief Mechanical Engineer (CME) G.G. Elliot. The locomotive was superheated, with a Belpaire firebox, Walschaerts valve gear and a bar frame. It was slightly more powerful than the Class 10-2 and was classified as Class 10 by the CSAR, with engine number 1002, along with the fifteen CSAR Class 10 4-6-2 locomotives that had been built by the North British Locomotive Company in 1904.[1][3][4][5]

South African Railways

The Union of South Africa was established on 31 May 1910, in terms of the South Africa Act, enacted by the Parliament of the United Kingdom. One of the clauses in the Act required that the three Colonial Government railways, the Cape Government Railways, the Natal Government Railways and the CSAR, also be united under one single administration to control and administer the railways, ports and harbours of the Union. While the South African Railways (SAR) came into existence in 1910, the actual classification and renumbering of all the rolling stock of the three constituent railways required careful planning and was only implemented with effect from 1 January 1912.[2][6]

In 1912 the sixteen CSAR Class 10 locomotives were reclassified and renumbered on the SAR roster. The older fifteen locomotives retained their classification on the SAR roster, but the ALCO built one was reclassified to the sole Class 10D and renumbered to no. 779.[2][7]

Service

The Class 10D was placed in service on fast passenger work in the Transvaal and later in the Orange Free State. It spent its last working years at Bloemfontein, until it was withdrawn from service in 1931 and scrapped.[1][3]

References

  1. 1 2 3 Holland, D.F. (1971). Steam Locomotives of the South African Railways, Volume 1: 1859-1910 (1st ed.). Newton Abbott, Devon: David & Charles. pp. 138–139. ISBN 978-0-7153-5382-0.
  2. 1 2 3 Classification of S.A.R. Engines with Renumbering Lists, issued by the Chief Mechanical Engineer’s Office, Pretoria, January 1912, pp. 9, 12, 15, 35 (Reprinted in April 1987 by SATS Museum, R.3125-6/9/11-1000)
  3. 1 2 3 Paxton, Leith; Bourne, David (1985). Locomotives of the South African Railways (1st ed.). Cape Town: Struik. p. 53. ISBN 0869772112.
  4. Durrant, A E (1989). Twilight of South African Steam (1st ed.). Newton Abbott, London: David & Charles. pp. 8–10. ISBN 0715386387.
  5. "Powerful Freight and Passenger Locomotives for a Narrow Gauge Railway". American Engineer and Railroad Journal: 192–194. May 1910. Retrieved 31 December 2012.
  6. The South African Railways - Historical Survey. Editor George Hart, Publisher Bill Hart, Sponsored by Dorbyl Ltd., Published c. 1978, p. 25.
  7. Holland, D.F. (1972). Steam Locomotives of the South African Railways, Volume 2: 1910-1955 (1st ed.). Newton Abbott, Devon: David & Charles. p. 140. ISBN 978-0-7153-5427-8.
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