The Cape Government Railways Type A 2-6-4T of 1902 was a South African steam locomotive from the pre-Union era in the Cape of Good Hope.
CGR Type A 2-6-4T South African NG 2-6-4T 1902
CGR Type A 2-6-4T no. 31, SAR no. NG25
Type and origin
Power type
Steam
Designer
Manning Wardle & Company
Builder
Manning Wardle & Company
Order number
51200
Serial number
1564 & 1565
Build date
Ex works 3 September 1902
Specifications
Configuration:
•Whyte
2-6-4T
•UIC
1'C2'n2t
Driver
2nd coupled axle
Gauge
2ft (610mm) narrow
Leading dia.
22in (559mm)
Coupled dia.
33in (838mm)
Trailing dia.
22in (559mm)
Wheelbase
20ft 9in (6,325mm)
•Coupled
6ft (1,829mm)
•Trailing
4ft (1,219mm)
Length:
•Over couplers
28ft 11in (8,814mm)
Width
7ft 9in (2,362mm)
Height
9ft 11in (3,023mm)
Frame type
Plate
Axle load
8LT 7cwt (8,484kg)
Loco weight
34LT 15cwt (35,310kg)
Fuel type
Coal
Fuel capacity
2LT (2.0t)
Water cap.
1,000impgal (4,550l)
Firebox type
Round-top
•Firegrate area
12sqft (1.1m2)
Boiler:
•Pitch
4ft 9in (1,448mm)
•Diameter
3ft 5in (1,041mm)
Boiler pressure
180psi (1,241kPa)
Cylinders
Two
Cylinder size
13in (330mm) bore 16in (406mm) stroke
Valve gear
Walschaerts
Loco brake
Steam brakes
Couplers
Bell-and-hook
Performance figures
Tractive effort
11,062lbf (49.21kN) @ 75%
Career
Operators
Cape Government Railways South African Railways
Class
Type A
Number in class
2
Numbers
CGR 31-32, SAR NG25-NG26
Delivered
1902
First run
1902
Withdrawn
1929
In 1902, the Cape Government Railways placed two Type A 2-6-4T narrow gauge steam locomotives in construction service on the Avontuur branch. In 1912, these locomotives were assimilated into the South African Railways and renumbered.[1][2][3][4]
Langkloof railway
In April 1902, authority was granted for the construction of the Langkloof 2ft (610mm) narrow gauge railway from Port Elizabeth via Humansdorp to Avontuur, a total distance of 177 miles (285 kilometres). It was to become one of the most important narrow gauge railways in South Africa and passed through districts which were famous for general agriculture and the export of wheat and fruit, especially apples. The line was laid with 35 pounds per yard (17 kilograms per metre) rail and was completed to Avontuur on 10 December 1906.[2]
Avontuur Railway
Coal consumption on the line averaged 54 pounds (24 kilograms) per train mile. A load from Port Elizabeth to Avontuur had to be hauled up 6,835 feet (2,083 metres) and, on the return journey, 3,963 feet (1,208 metres). This, in conjunction with the innumerable sharp curves and steep gradients of 1 in 40 (2½%) compensated, prevented a continuous high speed from being attained.[2]
Manufacturer
M&W works picture of no. 31
Two 2-6-4 Adriatic type narrow gauge tank steam locomotives were supplied to the Cape Government Railways (CGR) by Manning Wardle and Company in 1902. They were designated Type A and numbered 31 and 32.[1][2][5]
It is recorded that these locomotives, during tests, were able to haul a load of 150 long tons (152 tonnes) up a 1 in 40 (2½%) grade.[2]
Service
Cape Government Railways
Both locomotives were placed in construction service on the Avontuur narrow gauge railway and were also used as the first road power on the railway. At a width of 7feet 9inches (2,362 millimetres), they were extremely large and were the widest locomotives to see service on any of the 2 feet (610 millimetres) narrow gauge lines in South Africa.[1][6]
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.[4][7]
The two locomotives were renumbered to NG25 and NG26 on the South African Railways (SAR), with the NG prefix identifying them as narrow gauge locomotives in the SAR registers. They remained in service on the Avontuur branch for the duration of their service lives, until they were withdrawn in 1929 without having been classified by the SAR.[1]
Paxton, Leith; Bourne, David (1985). Locomotives of the South African Railways (1sted.). Cape Town: Struik. pp.112, 156. ISBN0869772112.
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.
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) (1sted.). Garden View, Johannesburg, South Africa: Vidrail Productions. p.232. ISBN9 780620 512282.
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)
Harman, Fred W. The Locomotives built by Manning Wardle & Company. Volume 3 Broad Gauge & Works List (1st ed. (undated)). Century Locoprints, Bridlington, UK. p.77. ISBN0 9535313 2 5.
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