SAR class GDA
| SAR class GDA | |
|---|---|
.jpg) Class GDA No. 2255, Stanger Depot, September 8, 1966
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| Numbering: | 2255-2259 |
| Number: | 5 |
| Manufacturer: | Left-Hofmann |
| Year of construction (s): | 1929 |
| Retirement: | k. A. |
| Type : | (1'C1 ') (1'C1') h4 (Garratt) |
| Gauge : | 1067 mm ( cape track ) |
| Length over coupling: | k. A. |
| Service mass: | 121.7 t |
| Friction mass: | 80.8 t |
| Wheel set mass : | 13.9 t |
| Driving wheel diameter: | 1155 mm |
| Impeller diameter: | k. A. |
| Cylinder diameter: | 381 mm |
| Piston stroke: | 610 mm |
| Boiler overpressure: | 124.1 N / cm² |
| Grate area: | 3.75 m² |
| Radiant heating surface: | 16.81 m² |
| Tubular heating surface: | 144.9 m² |
| Superheater area : | 36.2 m² |
| Train brake: | Suction air brake |
The vehicles of the GDA class of the South African Railways (SAR) were articulated locomotives of the Garratt design . The five machines delivered in 1929 were intended for branch line operations with axle loads of 13.9 t; the axis order was (1'C1 ') (1'C1').
The design of the locomotives was based on the GD class , but were built by Linke-Hofmann - the only Garratts from this manufacturer.
In contrast to the GD class, the GDA had a round standing boiler ceiling and water tanks with a curved top and rounded upper longitudinal edges. With the same grate surface, the boiler had a larger diameter and slightly larger heating and superheater surfaces. With the same water and coal supplies, the axle load of the GDA was around a ton higher than that of the GD.
Initially, the machines were based on the north coast route in Natal , where they were stationed in Stanger . They later came to Port Elizabeth and were used on the route to Grahamstown .
Most recently, the locomotives, which were not very popular with the staff, were used for ballast trains. Two copies have been preserved - not operational: No. 2257 is a memorial on the station forecourt in Grahamstown, No. 2259 belongs to the South African National Railway and Steam Museum in Krugersdorp .
literature
- AE Durrant: Garratt locomotives of the world. Birkhäuser, Basel et al. 1984, ISBN 3-7643-1481-8 .
