CGR Type A 2-6-4T

CGR Type A 2-6-4T
South African NG 2-6-4T 1902

300px CGR Type A 2-6-4T no. 31 of 1902, 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 2-6-4T (Adriatic) Driver axle 2nd coupled axle Gauge 2 ft (610 mm) narrow Leading dia 22 in (559 mm) Coupled dia 33 in (838 mm) Trailing dia 22 in (559 mm) Wheelbase 20 ft 9 in (6,325 mm)  • Coupled 6 ft (1,829 mm)  • Trailing 4 ft (1,219 mm) Length:  • Over couplers 28 ft 11 in (8,814 mm) Width 7 ft 9 in (2,362 mm) Height 9 ft 11 in (3,023 mm) Frame type Outside plate Axle load Loco weight Fuel type Coal Fuel capacity 2 LT (2.0 t) Water cap Boiler:  • Pitch 4 ft 9 in (1,448 mm)  • Diameter 3 ft 5 in (1,041 mm)  • Firebox type Round-top Boiler pressure 180 psi (1,241 kPa) Firegrate area 12 sq ft (1.1 m2) Cylinders Two Cylinder size 13 in (330 mm) bore 16 in (406 mm) stroke Valve gear Walschaerts Loco brake Steam brakes Couplers Bell lift-hook

Performance figures Tractive effort 11,062 lbf (49.21 kN) @ 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South African Railways Class Type A Number in class 2 Numbers CGR 31-32, SAR NG25-NG26 Delivered 1902 First run 1902 Withdrawn 1929

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.

In 1902, the Cape Government Railways placed two Type A 2-6-4T Adriatic type narrow gauge steam locomotives in construction service on the Avontuur branch. In 1912, these locomotives were assimilated into the South African Railways and renumbered.

Langkloof line

In April 1902, authority was granted for the construction of the Langkloof 2 feet (610 millimetres) narrow gauge line, 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 lines 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.

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 rate of speed from being attained.

Manufacturer

File:CGR Type A 2-6-4T.jpg

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 classified Type A and numbered 31 and 32.

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.

Service

Cape Government Railways

Both locomotives were placed in construction service on the Avontuur narrow gauge line. At a width of 7 feet 9 inches (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.

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 required careful planning and was only implemented with effect from 1 January 1912.

The two locomotives were renumbered no. 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.