(All photos © JohnA)

Engineered by S W Yockney, Rhondda is the longest disused tunnel in Wales at 3,443 yards. Today it is buried at both ends. Though single line through it, the Rhondda and Swansea Bay Railway became double track as it emerged into daylight. Construction was carried out from both ends, resulting in a slight kink in the middle where the two sections met.

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