SAR class NGG 11
| SAR class NGG 11 | |
|---|---|
 SAR class NGG 11 No. 51 around 1919
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| Numbering: | NG 51-55 |
| Number: | 5 |
| Manufacturer: | Beyer-Peacock |
| Year of construction (s): | 1919, 1925 |
| Retirement: | 1960s – 1970s |
| Type : | (1'C) (C1 ') n4 (h4) (Garratt) |
| Gauge : | 610 mm |
| Length over coupling: | 13,843 mm |
| Service mass: | 45.5 (49) tons |
| Friction mass: | 36.7 (39.3) tons |
| Wheel set mass : | 6.3 (6.6) t |
| Driving wheel diameter: | 762 mm |
| Impeller diameter: | k. A. |
| Cylinder diameter: | 266 mm |
| Piston stroke: | 406 mm |
| Boiler overpressure: | 124.1 N / cm² |
| Grate area: | 1.79 (1.81) m² |
| Radiant heating surface: | 7.52 (7.49) m² |
| Tubular heating surface: | 83.5 (61.4) m² |
| Superheater area : | (13.1 m²) |
| Train brake: | Suction air brake |
The NGG 11 class vehicles were the first Garratt locomotives operated by South African Railways (SAR). They were narrow-gauge locomotives for 610 mm gauge. The class designation NGG 11 ( Narrow Gauge Garratt ) continued the series of numbers that began with stiff-framed locomotives (classes NG 1 to NG 10).
The first three locomotives were ordered together with the Kapspur-Garratts of classes GA and GB as early as 1914. However, due to the First World War, delivery was delayed until 1919, with the narrow-gauge locomotives being the first to go into service, which later became the largest Garratt fleet in the world.
The machines were the only South African Garratts that had no superheaters and were equipped with flat slide valves. They proved their worth, so that in 1925 two more copies were purchased, but this time with piston valves and superheaters , which also increased the weight (data in brackets in the table opposite).
Two of the three wet steam locomotives were scrapped in the early 1960s. The third (NG 52) was sold to a platinum mine, where it was in use at least occasionally until 1970. It initially belonged to the inventory of the South African National Railway and Steam Museum in Krugersdorp . It was sold to Sandstone Estates and refurbished to be operational by 2017.
The superheated steam locomotives NG 54 and 55 were in use until the 1970s. Both have been preserved. The NG 54 was reactivated in the 1980s and was used for several years on the Avontuur Railway in front of tourist trains, then as a monument locomotive in Port Elizabeth . In the meantime she has also been placed in a safe place at Sandstone Estates. The NG 55 of the Estcourt – Weenen narrow-gauge railway stood in Weenen for a long time , was then restored and is now on the Patons Country Narrow Gauge Railway .
literature
- AE Durrant: Garratt locomotives of the world. Birkhäuser, Basel et al. 1984, ISBN 3-7643-1481-8 .
