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The reference for locomotives and railcars

Cape Government Railways class 7 (1896)

South African class 7A

South Africa 1896 46 produced
7A No. 1007 in September 1997 in Voorbaai Ian Roberts CC BY-SA 3.0

The second type of Class 7 4-8-0 locomotives procured by the Cape Government Railways was built from 1896 for the central and eastern regions. They all came from British manufacturers and 45 were delivered by 1898, while a single one came from Dübs in 1901.

These locomotives were a development of the 1891 model and again were designed by Beatty. Compared to their predecessors, they had a larger boiler and a larger tender. Only the first driving axle had no wheel flanges. In the 1930s, many were rebuilt with a superheater and piston valves.

The Sudanese military received eight identical locomotives in 1897 and 1898 and used them in the Mahdist War. They were also called “Dongola class”. They had been given water pipes to the front so that an additional tender could be coupled there for use in the desert.

Of the GCR's locomotives, all but two, which had previously been sold, were taken over by the SAR in 1912. During the First World War, some were used in the conquest of German South West Africa. Due to their suitability in this region, more were later relocated there. After replacing them with more modern steam locomotives and diesel locomotives, the SAR retired the last class 7A locomotives in 1972.

Technical data

General

Property as built superheated
Built 1896-1898, 1901
Manufacturers Sharp, Stewart & Co., Dübs & Co., Neilson & Co.
Wheel arrangement 4-8-0 (Twelve-wheeler)
Gauge 1,067 mm (Cape gauge)

Dimensions and weights

Property as built superheated
Length 16.29 m
Wheelbase 6.49 m
Total wheelbase 14.07 m
Service mass 47.2 t 49.9 t
Adhesion mass 36.4 t 38.4 t
Total mass 81.9 t 84.5 t
Rigid wheelbase 3.66 m
Axle load 9.1 t 9.9 t
Water capacity 11,818 l
Fuel capacity 5.6 t (coal)

Boiler

Property as built superheated
Grate area 1.626 m² 1.672 m²
Firebox surface 9.476 m² 10.498 m²
Tube heating surface 90.673 m² 74.88 m²
Evaporative heating surface 100.15 m² 85.378 m²
Total heating surface 100.2 m² 104.5 m²
Superheater surface 19.138 m²

Power plant

Property as built superheated
Driver diameter 1,086 mm
Boiler pressure 11 bar 12.4 bar
Expansion type simple expansion
Cylinders two, 432 x 584 mm

Power

Property as built superheated
Power source steam
Estimated power 373 kW (507 PS) 522 kW (710 PS)
Starting effort 94.1 kN 105.8 kN

Calculated values

Property as built superheated
Factor of adhesion 1 : 3.79 1 : 3.56
Optimal speed 24 km/h 31 km/h
Power-to-weight ratio 7.9 kW/t 10.5 kW/t
Heating Surface Equivalent 147.5 m² 176.1 m²
Cylinder volume/HSE 1 : 1,159.76 1 : 971.36
Adhesive weight/Total 1 : 1.30
Tractive force/Heating surface 1 : 19.62 1 : 21.15
Grate area/Heating surface 1 : 61.59 1 : 62.51
Firebox/Tube surface 1 : 9.57 1 : 7.13
Total/Superheater 1 : 4.46
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