CGR NG 4-6-2T

The Cape Government Railways NG 4-6-2T of 1908 was a South African narrow-gauge steam locomotive from the pre-Union era in the Cape of Good Hope.

CGR NG 4-6-2T
South African NG 4-6-2T
CGR narrow-gauge 4-6-2T
Type and origin
Power typeSteam
DesignerW.G. Bagnall
BuilderW.G. Bagnall
Serial number1866-1867
Build dateMay & June 1908 (ex works)
Specifications
Configuration:
​
 • Whyte4-6-2T
 • UIC2'C1'n2t
Driver2nd coupled axle
Gauge2 ft (610 mm) narrow
Leading dia.22 in (559 mm)
Coupled dia.33 in (838 mm)
Trailing dia.22 in (559 mm)
Wheelbase19 ft 1 in (5,817 mm)
 • Leading4 ft (1,219 mm)
 • Coupled6 ft 3 in (1,905 mm)
Wheel spacing
(Asymmetrical)		1-2: 3 ft 3 in (991 mm)
2-3: 3 ft (914 mm)
Length:
​
 • Over couplers27 ft 8 in (8,433 mm)
Height10 ft 6 in (3,200 mm)
Frame typeBar
Axle load7 LT 1 cwt 1 qtr (7,176 kg)
 • Leading3 LT (3,048 kg)
 • 1st coupled6 LT 16 cwt 1 qtr (6,922 kg)
 • 2nd coupled7 LT 1 cwt 1 qtr (7,176 kg)
 • 3rd coupled6 LT 16 cwt 1 qtr (6,922 kg)
Loco weight28 LT 13 cwt 3 qtr (29,150 kg)
Fuel typeCoal
Fuel capacity1 LT (1.0 t)
Water cap.550 imp gal (2,500 L)
Firebox typeRound-top
 • Firegrate area7.6 sq ft (0.71 m2)
Boiler:
​
 • Pitch4 ft 10+1⁄2 in (1,486 mm)
 • Diameter3 ft 2+1⁄8 in (968 mm)
Boiler pressure180 psi (1,241 kPa)
Safety valveRamsbottom
Heating surface:
 • Firebox		38.9 sq ft (3.61 m2)
CylindersTwo
Cylinder size11+3⁄4 in (298 mm) bore
16 in (406 mm) stroke
Valve gearWalschaerts
CouplersBell-and-hook
Performance figures
Tractive effort9,032 lbf (40.18 kN) @ 75%
Career
OperatorsCape Government Railways
South African Railways
Number in class2
NumbersCGR 42-43, SAR NG33-NG34
Delivered1908
First run1908
Withdrawn1929
The 2nd coupled axle had flangeless wheels

In 1908, the Cape Government Railways placed two 4-6-2T Pacific type narrow-gauge steam locomotives in passenger service on the Walmer branch in Port Elizabeth. In 1912, both locomotives were assimilated into the South African Railways and renumbered.[1][2][3][4]

Manufacturer

Two 4-6-2T narrow-gauge steam locomotives were built for the Cape Government Railways (CGR) by W.G. Bagnall in 1908. The engines were equally powerful tank locomotive versions of the [[South African Class NG8 4-6-0|CGR Type B 4-6-0]] narrow-gauge tender locomotive of 1904, also built by Bagnall, but with Walschaerts instead of Stephenson valve gear. They were not classified and were numbered 42 and 43.[2][3][5][6]

Characteristics

Like their Type B 4-6-0 sister engines, the locomotives had bar frames. The drivers, the middle wheelset of the coupled wheels, were flangeless to enable the engine to negotiate sharp curves. The coupled wheels were not spaced equidistant from each other, with 39 inches (991 millimetres) between the wheel centres of the leading wheelset and the drivers and 36 inches (914 millimetres) between the wheel centres of the drivers and the trailing wheelset.[3]

Service

Cape Government Railways

In 1906, a passenger-only suburban branch line had been opened from Valley Junction, near Port Elizabeth on the Avontuur line, to the suburb of Walmer. It was used by up to 22 trains per day. Both locomotives were placed in service on the Walmer branch line.[2][3][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, the actual classification and renumbering of all the rolling stock of the three constituent railways were only implemented with effect from 1 January 1912.[1][8]

In 1912, the two locomotives were renumbered no. NG33 and NG34 on the South African Railways (SAR), with the "NG" number prefix identifying them as narrow-gauge locomotives in the SAR registers. They remained in service on the Walmer branch for the duration of their service lives, until the line was closed in 1929. They were then withdrawn from service, shortly before a classification system for narrow-gauge locomotives was to be introduced by the SAR.[2][3]

References
Wikimedia Commons has media related to CGR NG 4-6-2T.
  1. Classification of S.A.R. Engines with Renumbering Lists, issued by the Chief Mechanical Engineer’s Office, Pretoria, January 1912, p. 47 (Reprinted in April 1987 by SATS Museum, R.3125-6/9/11-1000)
  2. Paxton, Leith; Bourne, David (1985). Locomotives of the South African Railways (1st ed.). Cape Town: Struik. pp. 113, 156. ISBN 0869772112.
  3. Espitalier, T.J.; Day, W.A.J. (1944). The Locomotive in South Africa - A Brief History of Railway Development. Chapter II - The Cape Government Railways (Continued). South African Railways and Harbours Magazine, April 1944. pp. 253-257.
  4. Dulez, Jean A. (2012). Railways of Southern Africa 150 Years (Commemorating One Hundred and Fifty Years of Railways on the Sub-Continent – Complete Motive Power Classifications and Famous Trains – 1860–2011) (1st ed.). Garden View, Johannesburg, South Africa: Vidrail Productions. p. 232. ISBN 9 780620 512282.
  5. Baker, Allan C.; Civil, T. D. Allen (1984). Bagnalls of Stafford – Locomotive Works List (1st ed.). England: The Industrial Locomotive Society
  6. Soul of A Railway - System 3: Cape Midland, based in Port Elizabeth – Part 1: The Port Elizabeth Narrow Gauge – Captions 8–10 Archived 24 July 2021 at the Wayback Machine (Accessed on 10 December 2016)
  7. Rollison, Richard (23 November 1973). "Saga of the Apple Express". Evening Post. Retrieved 26 December 2011..
  8. The South African Railways - Historical Survey. Editor George Hart, Publisher Bill Hart, Sponsored by Dorbyl Ltd., Published c. 1978, p. 25.
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