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