CGR type A
| CGR type A SAR No. NG 25–26 |
|
|---|---|
 CGR type A 2-6-4T No. 31 from 1902, SAR No. NG25
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| Numbering: | CGR: NS 31-32 |
| Number: | 2 |
| Manufacturer: | Manning Wardle |
| Year of construction (s): | 1902 |
| Retirement: | 1929 |
| Type : | 1'C2 'n2t |
| Gauge : | 610 mm |
| Length over coupling: | 8,814 mm |
| Fixed wheelbase: | 1,829 mm |
| Total wheelbase: | 6,325 mm |
| Service mass: | 35.4 t |
| Friction mass: | 25.2 t |
| Wheel set mass : | 8.5 t |
| Driving wheel diameter: | 838 mm |
| Cylinder diameter: | 330 mm |
| Piston stroke: | 406 mm |
| Boiler overpressure: | 124.0 N / cm² |
| Grate area: | 1.11 m² |
| Radiant heating surface: | 5.11 m² |
| Tubular heating surface: | 46.45 m² |
| Train brake: | Suction air brake |
The Cape Government Railways (CGR) vehicles designated as Type A were tank locomotives with a 1'C2 ' wheel arrangement. They were procured in 1902 for the Avontuur Railway , which was under construction , and were among the first 610 mm narrow-gauge locomotives in South Africa.
The locomotives built by Manning Wardle were the widest South African narrow-gauge steam locomotives at 2,362 mm, and the axle load of 8.5 t was not achieved by any other narrow-gauge locomotive in South Africa until the introduction of class 91 diesel locomotives .
Because of their higher frictional load, the type A had a greater pulling force than the 2'C machines of the type B - on gradients of 2.5% (1:40), 170 t could still be driven at 8 mph (approx. to get promoted. However, this tractive effort was seldom necessary in mainline service, and the type A, which as tank locomotives had a shorter range, were mainly used in short-distance and shunting service.
Initially, the locomotives only had track numbers 1 and 2. Because of the risk of confusion with the locomotives of the Hopefield Railway ( CGR No. NG 1 to 3 ), they were later renumbered to NG 31 and 32. After the CGR in the South African Rfailways (SAR) had risen, the locomotives were numbered NG 25 and 26. The locomotive no. 25 was just before the First World War moved to the Hopefield Railway, where they until their conversion to Cape gauge in Was use.
The locomotives were retired in the late 1920s, even before they were given a SAR class designation. Neither of the two copies has survived.
literature
- Sydney M. Moir: Twenty-Four Inches Apart. The two-foot gauge railways of The Cape of Good Hope. 2nd edition (revised). Janus, Kempton Park 1981, ISBN 0-620-05460-3 .
- Leith Paxton, David Bourne: Locomotives of the South African Railways. A Concise Guide. C. Strui (Pty) Ltd., Cape Town 1985, ISBN 0-86977-211-2 .
