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The first junction beyond the viaduct was at Penrhos Junction, which provided connections to the Rhymney Railway lines from the West side of the Rhymney Valley and Senghenydd, the Barry Railway line continued over Penyrheol and Llanbradach Viaducts to connect with the Brecon and Merthyr Railway line from the Eastern side of the Rhymney Valley at Barry (B & M ) Junction.

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