The Cegin valley was heavily industrialised in the 18th and 19th centuries with two separate railway lines conveying slate from quarries in the hills down to Porth Penrhyn to be shipped out to destinations across the world. Much evidence of this still remains with one of the old railway beds now used as a cycle-way and footpath. Just above Port Penrhyn a series of closely connected old bridges cross the Cegin. This complex is a listed building.
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