South African Class 2 4-6-2
|South African Class 2 4-6-2
ex NGR Class A 4-6-2 1905
NGR Class A no. 326, SAR Class 2 no. 763
|Designer||Natal Government Railways|
|Builder||North British Locomotive Company|
|Serial number||16192-16193 |
|Model||NGR Hendrie A|
|Gauge||3 ft 6 in (1,067 mm) Cape gauge|
|28.5 in (724 mm)|
|Driver diameter||51 in (1,300 mm)|
|30 in (762 mm)|
|Wheelbase||Total: 51 ft 1.375 in (15.580 m)
6 ft (1.829 m) bogie
9 ft 4 in (2.845 m) coupled
27 ft 10 in (8.484 m) total
4 ft 6 in (1.372 m) bogie
15 ft 6 in (4.724 m) total
|Length||58 ft 4 1⁄8 in (17.783 m)|
|Height||12 ft 6 in (3.810 m)|
|Axle load||15 long tons (15.2 t) on 2nd driver|
|Weight on drivers||43.75 long tons (44.5 t)|
|Locomotive weight||66.3 long tons (67.4 t)|
|Tender weight||39,318 lb (17.8 t) empty
37.95 long tons (38.6 t) w/o
|Locomotive and tender
|104.25 long tons (105.9 t) w/o|
* 2 axle bogies
* 30 in (762 mm) wheels
* Length 22 ft 9.3125 in (6.942 m)
|Fuel capacity||6 long tons (6.1 t)|
|Water capacity||3,225 imp gal (14,660 l)|
|Boiler||5 ft 0.75 in (1.543 m) inside diameter
16 ft 4.75 in (4.997 m) inside length
7 ft 3 in (2.210 m) pitch
|Boiler pressure||180 psi (1,240 kPa)|
|Firegrate area||28 sq ft (2.601 m2)|
|246 tubes 2 in (50.8 mm) diameter
2,112 sq ft (196.211 m2)
|– Firebox||119 sq ft (11.055 m2)|
|– Total||2,231 sq ft (207.267 m2)|
|Cylinder size||19 in (483 mm) bore
24 in (610 mm) stroke
|Tractive effort||22,940 lbf (102.0 kN) at 75% pressure|
|Operator(s)||Natal Government Railways
South African Railways
|Class||NGR Class A
SAR Class 2 
|Number in class||2|
SAR 762-763 
In 1905 the Natal Government Railways placed two Class A steam locomotives with a 4-6-2 Pacific type wheel arrangement in service. In 1912, when these locomotives were assimilated into the South African Railways, they were renumbered and designated Class 2.
In 1904 orders were placed with the North British Locomotive Company (NBL) for two 4-6-2 Pacific type locomotives for the Natal Government Railways (NGR). They were designed by NGR Locomotive Superintendent D.A. Hendrie for passenger traffic on those sections of the mainline between Ladysmith and Charlestown that did not have very severe gradients. When they were delivered and placed in service early in 1905, they became the NGR Class A, numbered 325 and 326 and also known as the Class Hendrie A.
They used saturated steam, had Stephenson valve gear and were built on plate frames. After these two engines, however, Hendrie adopted Walschaerts valve gear on all his future designs, for its greater accessibility.
To accommodate the wide and deep firebox, Hendrie made use of a bridle casting along the same lines as that introduced on the Cape Government Railways (CGR) by H.M. Beatty in 1903 on what was later to become the Class 6Y. This method of widening the frames for the firebox continued long after Hendrie retired on pension in June 1922, and only the general adoption of bar frames for mainline locomotives from 1927 onwards rendered it no longer necessary.
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 CGR, the NGR and the Central South African Railways, 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.
- List of South African locomotive classes
- South African Class 2C 4-6-2
- South African locomotive history
- Tender locomotive numbering and classification
- The 4-6-2 "Pacific"
- Holland, D.F. (1971). Steam Locomotives of the South African Railways, Volume 1: 1859-1910 (1st ed.). Newton Abbott, Devon: David & Charles. pp. 101–102. ISBN 978-0-7153-5382-0.
- North British Locomotive Company works list, compiled by Austrian locomotive historian Bernhard Schmeiser
- Classification of S.A.R. Engines with Renumbering Lists, issued by the Chief Mechanical Engineer’s Office, Pretoria, January 1912, pp. 7, 12, 15, 35 (Reprinted in April 1987 by SATS Museum, R.3125-6/9/11-1000)
- Holland, D.F. (1972). Steam Locomotives of the South African Railways, Volume 2: 1910-1955 (1st ed.). Newton Abbott, Devon: David & Charles. p. 137. ISBN 978-0-7153-5427-8.
- Paxton, Leith; Bourne, David (1985). Locomotives of the South African Railways (1st ed.). Cape Town: Struik. pp. 35–36. ISBN 0869772112.
- The South African Railways - Historical Survey. Editor George Hart, Publisher Bill Hart, Sponsored by Dorbyl Ltd., Published c. 1978, p. 25.