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Hex River Tunnels
Hexton is a railway route between De Doorns and Kleinstraat through the Hex River Mountains of the Western Cape Province, South Africa, that consists of four tunnels, three passing loops and a road-over-rail bridge. The line, which connects De Doorns in the Hex River valley with Touws River in the Little Karoo, is part of the main rail route between Cape Town and Johannesburg. Of the of track, are underground. The four Hex River Tunnels consist of a twin tunnel of and three single tunnels of , and respectively. The Hexton line finally eliminated the bottleneck of the Hex River rail pass.〔South African Construction World, July 1990, pp. 60–61〕〔〔(The World's longest Railway Tunnels )〕
==The Hex River rail pass==
The enormous Cape Fold Belt effectively separated Cape Town on the coast from the hinterland of Southern Africa, and had obstructed previous attempts to expand the Cape Colony's railway infrastructure inland. In 1872 the Cape Government, under Prime Minister John Molteno, ordered that a railway line must be constructed across this barrier in the vicinity of the Hex River Mountains. The Cape Government Railways (CGR) was formed and railway engineer Thomas Brounger was appointed to oversee the task.〔''The Royal Commonwealth Society'', 1898, "Proceedings of the Royal Colonial Institute". The Institute, Northumberland Avenue, London, W.C. p. 26.〕〔''SABC'', 14 August 1954, John Bond. ''"John Molteno: Founder of the South African Railways"'', p. 3.〕
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