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The reference for locomotives and railcars

Cape Government Railways Fairlie

South Africa 1875 2 produced
No. E34 of 1878 Frank Holland collection PD

The first articulated locomotive ever to be operational in Africa was a six-axle Double Fairlie built by Avonside in 1875 for the CGR. This locomotive, numbered E33, was also the first locomotive in Africa with Walschaerts valve gear. It was ordered for mainlines around East London which had steep inclines.

In trials against two permanently-coupled 0-6-0T locomotives, it showed better running qualities on downhill stretches and a better fuel economy. But like all Double Fairlies, it had very limited space in the cab what made it very unpopular with crews. But in general, it was still called a successful design with some improvements to be made in the area of the joints, bogies, sandboxes and water capacity.

In 1878, a second locomotive numbered E34 was delivered that incorporated most of the suggested improvements, but without a larger water capacity. More water could be loaded into a separate tender. The biggest point of criticism was still the cramped cab, and so both locomotives were quickly removed from mainline service and used as shunters. Both were scrapped in 1903.

Technical data

General

Property E33 E34
Built 1875 1878
Manufacturers Avonside
Wheel arrangement 0-6-6-0T (Double Fairlie)
Gauge 1,067 mm (Cape gauge)

Dimensions and weights

Property E33 E34
Length 13.77 m 11.43 m
Wheelbase 8.84 m 7.67 m
Service mass 36.6 t
Adhesion mass 36.6 t
Rigid wheelbase 2.29 m
Axle load 6.1 t
Water capacity 3,819 l
Fuel capacity 2.1 t (coal) 1.3 t (coal)

Boiler

Property E33 E34
Grate area 1.301 m²
Firebox surface 8.361 m²
Tube heating surface 84.356 m²
Evaporative heating surface 92.717 m²
Total heating surface 92.7 m²

Power plant

Property E33 E34
Driver diameter 991 mm 1,003 mm
Boiler pressure 9.3 bar 9 bar
Expansion type simple expansion
Cylinders four, 292 x 457 mm

Power

Property E33 E34
Power source steam
Estimated power 186 kW (253 PS)
Starting effort 62.3 kN 59.2 kN

Calculated values

Property E33 E34
Factor of adhesion 1 : 5.76 1 : 6.06
Optimal speed 18 km/h 19 km/h
Power-to-weight ratio 5.1 kW/t
Heating Surface Equivalent 134.5 m²
Cylinder volume/HSE 1 : 911.02
Adhesive weight/Total 1 : 1.00
Tractive force/Heating surface 1 : 14.04 1 : 13.35
Grate area/Heating surface 1 : 71.27
Firebox/Tube surface 1 : 10.09
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