South African Class 2 4-6-2

South African Class 2 4-6-2
NGR Class Hendrie A 326, SAR Class 2 763
Power type Steam
Designer Natal Government Railways
Builder North British Locomotive Company
Serial number 16192-16193[1][2]
Model NGR Hendrie A
Build date 1904
Total produced 2
Configuration 4-6-2 "Pacific"
Gauge 3 ft 6 in (1,067 mm) Cape gauge
Leading wheel
diameter		 28.5 in (724 mm)
Driver diameter 51 in (1,300 mm)
Trailing wheel
diameter		 30 in (762 mm)
Wheelbase Total: 51 ft 1.375 in (15.580 m)
Engine:
6 ft (1.829 m) pilot
9 ft 4 in (2.845 m) coupled
27 ft 10 in (8.484 m) total
Tender:
4 ft 6 in (1.372 m) bogie
15 ft 6 in (4.724 m) total
Length 58 ft 4.125 in (17.783 m)
Height 12 ft 6 in (3.810 m)
Frame Plate frame
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 & tender
combined weight		 104.25 long tons (105.9 t) w/o
Tender type SH
* 2 axle bogies
* Wheels 30 in (762 mm) dia
* Length 22 ft 9.3125 in (6.942 m)
Fuel type Coal
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) int dia
16 ft 4.75 in (4.997 m) int length
7 ft 3 in (2.210 m) pitch
Boiler pressure 180 psi (1,240 kPa)
Firegrate area 28 sq ft (2.601 m2)
Heating surface:
Tubes		 246 tubes 2 in (50.8 mm) ext dia
2,112 sq ft (196.211 m2)
Heating surface:
Firebox		 119 sq ft (11.055 m2)
Heating surface:
Total		 2,231 sq ft (207.267 m2)
Cylinders Two
Cylinder size 19 in (483 mm) bore
24 in (610 mm) stroke
Valve gear Stephenson
Tractive effort 22,940 lbf (102.0 kN) at 75% boiler pressure[1]
Career Natal Government Railways
South African Railways
Class NGR Class Hendrie A
SAR Class 2
Number in class 2
Number NGR 325-326
SAR 762-763[1][3][4]
Delivered 1905
First run 1905
Withdrawn 1936
Disposition Retired

In 1905 the Natal Government Railways placed two Class Hendrie A steam locomotives with a 4-6-2 Pacific wheel arrangement in service. In 1912, when these locomotives were assimilated into the South African Railways, they were renumbered and classified as Class 2.[1][3][5]

Contents

Manufacturer

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 main line 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 Hendrie A, numbered 325 and 326.[5]

Characteristics

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.[1][5]

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 main line locomotives from 1927 onwards rendered it no longer necessary.[1]

Service

The two locomotives ran their first trials in early 1905. They were placed in service between Ladysmith and Charlestown, as intended. In 1912, when these two "Pacifics" were taken onto the roster of the South African Railways (SAR), they were renumbered 762 and 763 and classified as Class 2.[3][5]

They were later transferred to the Witwatersrand for a short period, after which they worked on the Komatipoort-Waterval Boven section until they were withdrawn by 1936.[1][5]

See also

References

  1. ^ a b c d e f g 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 0715353829. 
  2. ^ North British Locomotive Company works list, compiled by Austrian locomotive historian Bernhard Schmeiser
  3. ^ a b c 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)
  4. ^ 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 0715354272. 
  5. ^ a b c d e Paxton, Leith; Bourne, David (1985). Locomotives of the South African Railways (1st ed.). Cape Town: Struik. pp. 35-36. ISBN 0869772112.