Fron Goch tramway
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From the present day hill track, the abutments of the slate waste tip look as if a bridge was meant to soar across. Pure speculation but maybe rubbish tracks did bridge the road here, to allow tipping to continue towards the wharf ?
(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