Locomotive 0-6-0T No 193 and terraced houses at the Clydach Vale Colliery, Rhondda Valley in Wales, as seen from the cab of 0-6-0T locomotive No 194. The rope-worked 1 in 13 Pwllyrhebog Incline on the former Taff Vale Railway branch from Tonypandy to the Clydach Vale Colliery in the Rhondda Valley was three-quarters of a mile in length and was operated by a stationary engine which drove two inter-geared drums, so that a descending rain counterbalanced an ascending one. A design feature of these locomotives was a coned boiler which prevented the water level falling below the top of the firebox whilst on the gradient. Photograph by Dr Patrick Ransome-Wallis.
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