Hex River Tunnel No 4
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The fourth tunnel of the Hex River Tunnels. At 13.5 kilometres it was the longest single railway tunnel in Africa. It is on the Hexton railway route between De Doorns and Kleinstraat through the Hex River Mountains. It connects De Doorns in the Hex River valley with Touws River in the Great Karoo and is part of the main rail route between Cape Town and Johannesburg. The tunnel system became operational in April 1989, more than forty years after the first portals were sunk, and was officially opened on 27 November 1989.
Tunnel 4 was the longest railway tunnel in Africa until 2009. The present longest single railway tunnel in Africa is 15.5 kilometres long, on the Gautrain line between Johannesburg Park Station and Marlboro Portal, which was broken through in September 2009.
(Extracted from Wikipedia, accessed 2020 10 29)