Cwm Orthin Quarry
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(Redirected from Cwm Orthin)
Cwm Orthin tramway (1850), serving Cwm Orthin Quarry, and extended to also serve Conglog, descended 2 inclines to join the railway just above Tanygrisiau.
See also "Cwmorthin Slate Quarry" by Graham Isherwood ISBN 0-9522979-1-4