South African Class NG7 2-6-0
South African Class NG7 2-6-0 ex CGR Type A 2-6-0 | |
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Baldwin works photograph, circa 1902 | |
Type and origin | |
Power type | Steam |
Designer | Baldwin Locomotive Works |
Builder | Baldwin Locomotive Works |
Serial number | 19456, 19649, 19650, 36375 |
Build date | 1901-1911 [1] |
Total produced | 4 |
Specifications | |
Configuration | 2-6-0 "Mogul" |
Gauge | 2 ft (610 mm) narrow gauge |
Driver diameter | 838 mm (33 in) |
Wheelbase |
3.912 m (12 ft 10.0 in) engine 2.134 m (7 ft 0 in) coupled |
Length | 43 ft 9.75 in (13.354 m) |
Frame | Bar frame |
Axle load | 5.9 t (5.8 long tons) per driver |
Weight on drivers | 17.6 t (17.3 long tons) |
Locomotive weight | 19.9 t (19.6 long tons) w/o |
Tender weight | 21.1 t (20.8 long tons) w/o |
Locomotive and tender combined weight | 41 t (40.4 long tons) w/o |
Fuel type | Coal |
Boiler pressure | 1,240 kPa (180 psi) |
Firegrate area | 0.71 m2 (7.6 sq ft) |
Heating surface: – Tubes | 35.39 m2 (380.9 sq ft) |
– Firebox | 3.75 m2 (40.4 sq ft) |
– Total | 39.14 m2 (421.3 sq ft) |
Cylinders | Two |
Cylinder size |
298 mm (11.7 in) bore 406 mm (16 in) stroke [2] |
Valve gear | Stephenson |
Performance figures | |
Tractive effort | 9,032 lbf (40 kN) at 75% pressure |
Career | |
Operator(s) |
Cape Government Railways South African Railways |
Class | Class NG7 [1] |
Number in class | 4 |
Number(s) |
CGR 1-4 SAR NG22-NG24, NG35 [3] |
Delivered | 1902-1911 |
First run | 1902 |
Withdrawn | 1926 [1] |
The South African Class NG7 2-6-0 of 1902 is a South African steam locomotive from the pre-Union era in the Cape Colony.
In 1902 the Cape Government Railways placed three steam locomotives with a 2-6-0 Mogul wheel arrangement in service on the Hopefield narrow gauge branchline that was being constructed from Kalbaskraal. A fourth locomotive was ordered in 1911.[1][3]
In 1912, when these locomotives were assimilated into the South African Railways, they were renumbered with an "NG" prefix to their numbers. When a system of grouping narrow gauge locomotives into classes was eventually introduced somewhere between 1928 and 1930, they were to be classified as Class NG7 but had already been withdrawn from service.[1][3]
Manufacturer
The Cape Government Railways (CGR) ordered three narrow gauge tender locomotives with a 2-6-0 Mogul wheel arrangement from Baldwin Locomotive Works in 1901. They were numbered 1 to 3 when they were delivered in 1902 and was known as the CGR Type A. A fourth locomotive, identical to the first three, was ordered from the same manufacturer in 1911 and became CGR number 4 upon delivery in that same year.[1]
Characteristics
The locomotives were of a standard type that was being used on the narrow gauge railroads of Maine in the United States of America. They had bar frames and used Stephenson valve gear.[1]
Service
The first three locomotives were acquired for use during the construction of the narrow gauge branchline from Kalbaskraal to Hopefield. They remained in service on that line after it was completed in 1903 and were joined by the fourth locomotive in 1911. In 1913 the line was extended to Saldanha, with a branch to Vredenburg. The four locomotives were withdrawn from service when these lines were widened to Cape gauge in 1926.[1][4]
Renumbering
The Union of South Africa was established on 31 May 1910, in terms of the South Africa Act. One of the clauses in the Act required that the three Colonial Government railways, the CGR, the Natal Government Railways 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.[3][4]
In 1912 narrow gauge locomotives were included in the SAR’s narrow gauge numbering scheme and were allocated engine numbers prefixed with the letters NG for narrow gauge. The three 1902 locomotives were allocated SAR numbers NG22 to NG24, while the 1911 locomotive became no. NG35.[3]
Narrow gauge classification
A system of grouping narrow gauge locomotives into classes was only adopted at some time between 1928 and 1930. However, these locomotives did not survive in service long enough to become the Class NG7 that had apparently been reserved for them when the classification system was being planned.[1]
See also
- List of South African locomotive classes
- Narrow Gauge locomotive numbering and classification
- South African locomotive history
- The 2-6-0 "Mogul"
- Two foot gauge railways in South Africa
References
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- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 Paxton, Leith; Bourne, David (1985). Locomotives of the South African Railways (1st ed.). Cape Town: Struik. pp. 104, 112. ISBN 0869772112.
- ↑ CGR Nr. NG 1 bis 3 – German Wikipedia article
- ↑ 3.0 3.1 3.2 3.3 3.4 Classification of S.A.R. Engines with Renumbering Lists, issued by the Chief Mechanical Engineer’s Office, Pretoria, January 1912, pp. 12, 16, 47 (Reprinted in April 1987 by SATS Museum, R.3125-6/9/11-1000)
- ↑ 4.0 4.1 The South African Railways - Historical Survey. Editor George Hart, Publisher Bill Hart, Sponsored by Dorbyl Ltd., Published c. 1978, p. 25.