Cwm Ebol tramway
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Neatly built slate causeway takes the ascending ramp 90 degrees across the cwm and into the quarry middle levels. Previous viewpoints were looking backwards and forwards from the top of the ramp, at middle left in this picture.
(click image to enlarge)
References
"The Slate Railways of Wales", Alun John Richards, pub. 2001 Gwasg Carreg Gwalch [Cymraeg] [English] ISBN 0-86381-689-4