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The Cedryn Quarry Tramway (later largely used as the route of the Eigiau Tramway) was an industrial narrow gauge railway that connected the slate quarries at Cedryn and Cwm Eigiau to the quays at Dolgarrog in the Conwy valley.
The lake can be reached by car only from Trefriw in the Conwy valley, though many visitors walk there from the village or from the neighbouring lake of Llyn Geirionydd, which runs parallel to it, but a mile distant, the two being separated by Mynydd Deulyn – “mountain of the two lakes”.
The Conwy Valley Line was constructed by the London and North Western Railway with the primary aim of transporting dressed slate from the Blaenau Ffestiniog quarries to a specially built quay at Deganwy for export by sea.
In the 1350s the Black Death took a heavy toll in the lower Conwy Valley, particularly among the bond tenants regulated by the King's officers from Aberconwy, Edward I's new English borough.