From Festipedia, hosted by the FR Heritage Group

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Ffestiniog Railway[edit]

Garnedd Tunnel above Tan-y-bwlch
Old Moelwyn Tunnel above Dduallt, blocked by the reservoir and never reopened
New Moelwyn Tunnel built in replacement as part of the Deviation
There is also the bridge at Rhiw Plas above Boston Lodge - although built as a bridge, due to length it could be classed as a tunnel

Welsh Highland Railway[edit]

Goat Tunnel immediately south of Beddgelert
Tunnels in the Aberglaslyn pass

See also[edit]