Cwm Ebol tramway
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Access to the lower floor of this enigmatic building must have been down the sloping passage seen in front. Chimney stack on the right behind the tree.
(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