Central South African class F
These eight locomotives were ordered as faster suburban tanks to work the line between Springs and Randfontein. Vulcan Foundry built these 4-6-4T in 1904 at the same time as the class 9 Pacific. P.A. Hyde designed both classes to use the same boiler, cylinders and Stephenson valve gear. The class F also had bar frames, but smaller drivers with a diameter of 54 inches and an electric headlight. Some suffered from frame fractures, so that a reinforcement had to be added to all.
They were originally numbered 260 to 267, but with the founding of the South African Railways they received the new numbers 78 to 85. The class still carried the designation F. Reportedly they had the nickname “Chocolate Boxes”, maybe due to their black livery with red stripes and the maintenance that always kept these locomotives clean and in best condition. The last class member was withdrawn in 1931.
Technical data
General
- Built
- 1904
- Manufacturers
- Vulcan Foundry
- Wheel arrangement
- 4-6-4T (Hudson)
- Gauge
- 1,067 mm (Cape gauge)
Dimensions and weights
- Length
- 12.64 m
- Wheelbase
- 10.39 m
- Service mass
- 80.3 t
- Adhesion mass
- 39.6 t
- Rigid wheelbase
- 3.35 m
- Axle load
- 13.2 t
- Water capacity
- 8,184 l
- Fuel capacity
- 3 t (coal)
Boiler
- Grate area
- 2.021 m²
- Firebox surface
- 12.17 m²
- Tube heating surface
- 125.419 m²
- Evaporative heating surface
- 137.59 m²
- Total heating surface
- 137.6 m²
Power plant
- Driver diameter
- 1,372 mm
- Boiler pressure
- 13.8 bar
- Expansion type
- simple expansion
- Cylinders
- two, 457 x 660 mm
Power
- Power source
- steam
- Estimated power
- 615 kW (836 PS)
- Starting effort
- 118.0 kN
Calculated values
- Factor of adhesion
- 1 : 3.30
- Optimal speed
- 32 km/h
- Power-to-weight ratio
- 7.7 kW/t
- Heating Surface Equivalent
- 198.4 m²
- Cylinder volume/HSE
- 1 : 1,092.73
- Adhesive weight/Total
- 1 : 2.03
- Tractive force/Heating surface
- 1 : 17.91
- Grate area/Heating surface
- 1 : 68.08
- Firebox/Tube surface
- 1 : 10.31