SAR class NG 9
| SAR class NG 9 | |
|---|---|
.jpg) SAR class NG 9
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| Numbering: | NG 42-47 |
| Number: | 6th |
| Manufacturer: | Baldwin |
| Year of construction (s): | 1915/16 |
| Type : | 2'C n2 |
| Gauge : | 610 mm |
| Length over coupling: | 13,522 mm |
| Fixed wheelbase: | 1,905 mm |
| Total wheelbase: | 3,988 mm |
| Service mass: | 20.6 t |
| Service mass with tender: | 41.7 t |
| Friction mass: | 16.5 t |
| Wheel set mass : | 5.9 t |
| Driving wheel diameter: | 838 mm |
| Cylinder diameter: | 298 mm |
| Piston stroke: | 406 mm |
| Boiler overpressure: | 124.0 N / cm² |
| Grate area: | 0.7 m² |
| Radiant heating surface: | 4.03 m² |
| Tubular heating surface: | 35.39 m² |
| Train brake: | Suction air brake |
The vehicles of the class NG 9 of the South African Railways (SAR) were Tender - steam locomotives with the wheel arrangement 2 'C for 610 mm narrow gauge ( NG stands for Narrow Gauge ). The machines were introduced on the Avontuur Railway in late 1915 .
history
At the beginning of the First World War, traffic on the Avontuur Railway was mainly handled with the nine type B locomotives of the former Cape Government Railways . The last time three machines of this class were put into operation in the years 1911-13, which were designated as Improved B because of a higher boiler heating surface .
During the war there was a shortage of locomotives due to the temporary relocation of narrow-gauge locomotives to South West Africa , and British manufacturers were unable to deliver during this time. So in 1915/16 six locomotives were procured from Baldwin , which were given the train numbers NG 42 to 47. They differed from the Improved B by slightly different grate and heating surfaces - with the same wheel alignment and identical barrel and engine dimensions . Significant difference was the replacement of Stephenson control by a Walschaerts control as they are already on the likewise derived from the Type B tank locomotives of "Walmer-type" was present.
The Baldwin locomotives, like their predecessors, stayed on the Avontuur Railway most of the time, but some also temporarily helped out on the Hopefield Railway .
In 1929 nos. NG 42 and 43 were retired and nos. NG 44 and 46 were relocated to the Upington - Kakamas line. No. NG 45 was the last specimen left in Port Elizabeth and was also relocated to Upington in 1939.
In 1951 the three still existing NG 9s were sold to Angola , where they were used on the Caminhos de Ferro de Moçâmedes . A few years later, this railway was converted to Cape Gauge; however, there is evidence that the locomotives, like many Angolan steam locomotives, have not been scrapped to this day.
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 .
