SAR class NGG 12
| SAR class NGG 12 | |
|---|---|
.jpg) Class NGG 12 No. NG 57, circa 1930
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| Numbering: | NG 56 and 57 |
| Number: | 2 |
| Manufacturer: | Franco Belge |
| Year of construction (s): | 1927 |
| Retirement: | 1959 |
| Type : | (1'C1 ') (1'C1') h4 (Garratt) |
| Gauge : | 610 mm |
| Service mass: | 36.6 t |
| Friction mass: | 22.8 t |
| Wheel set mass : | 3.8 t |
| Driving wheel diameter: | 762 mm |
| Impeller diameter: | k. A. |
| Cylinder diameter: | 228 mm |
| Piston stroke: | 406 mm |
| Boiler overpressure: | 124.1 N / cm² |
| Grate area: | 0.98 m² |
| Radiant heating surface: | 4.18 m² |
| Tubular heating surface: | 53.1 m² |
| Superheater area : | 9 m² |
| Train brake: | Suction air brake |
The vehicles of the class NGG 12 of the South African Railways (SAR) were steam locomotives of the Garratt design for 610 mm narrow-gauge lines with a particularly light superstructure. The two locomotives were built in 1927 by Société Franco-Belge as a subcontract from Beyer-Peacock and were given the track numbers NG 57 and NG 58.
The axle load of less than 4 t enabled it to be used on the Upington - Kakamas and Fort Beaufort - Seymour routes , where rails were laid with only 10 kg / m. A locomotive was assigned to each of the two routes. The NGG 12 on the latter route was supplemented in 1928 by the very similar but slightly larger NGG 14 .
In 1940 the Fort Beaufort – Seymour route was converted to Cape Gauge, and the NGG 12 No. NG 57 stationed there was relocated to the Upington – Kakamas route together with the NGG 14. In 1949 the gauging was completed there too, and the two NGG 12 were sold to the Rustenburg Platinum Mines, where they were given the numbers 5 and 6 and remained in service until 1959. They were then scrapped.
literature
- AE Durrant: Garratt locomotives of the world. Birkhäuser, Basel et al. 1984, ISBN 3-7643-1481-8 .
