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The reference for locomotives and railcars

Central South African class F

South Africa 1904 8 produced
Terry Rowe collection PD

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 The last class member was withdrawn in 1931.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
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