SAR class FD

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SAR class FD
Class FD No. 2323, later redrawn as No. 674
Class FD No. 2323, later redrawn as No. 674
Numbering: 2320-2323
Number: 4th
Manufacturer: North British
Year of construction (s): 1926
Retirement: 1957-1959
Type : (1'C1 ') (1'C1') h4
Gauge : 1067 mm ( cape track )
Length over coupling: k. A.
Service mass: 115.9 t
Friction mass: 74 t
Wheel set mass : 12.5 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: 3.8 m²
Radiant heating surface: 17.65 m²
Tubular heating surface: 144.4 m²
Superheater area : 33.4 m²
Train brake: Suction air brake

The vehicles of the class FD of the South African Railways (SAR) were articulated locomotives of the Modified Fairlie type . The locomotives were intended for secondary lines with axle loads of around 12.5 t; the axis order was (1'C1 ') (1'C1').

Like the somewhat lighter classes FC and GC , the class FD agreed with the Garratt class GD , which was developed in parallel, in all essential dimensions, so that the SAR could compare both types of joint with one another.

The four FD class locomotives were retired between 1957 and 1959, about ten years before the GD-Garratts. The stress on the pivot pins caused by the overhangs had led to higher maintenance costs than the latter.

literature

  • AE Durrant: Garratt locomotives of the world. Birkhäuser, Basel et al. 1984, ISBN 3-7643-1481-8 .

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