English: Barmouth bridge Barmouth bridge carries the Cambrian Coast railway across the Mawddach estuary. Opened in 1867, it was rebuilt in 1899 to alter the opening spans from sliding ones to the swinging span seen here at the near end of the bridge. Apart from the opening spans the bridge is a timber trestle. Plans to withdraw the Coast Line in 1971 met with organised opposition in the shape of the Cambrian Coast Line Action Group who successfully lobbied against closure. Another threat to the bridge came in 1980 when it was discovered that the teredo worm had infested the footings of the timber section and made it unsafe. The action group were again involved and ultimately extensive repairs were made and rail traffic continues to run from Machynlleth to Pwllheli along the coast. The rocks on the sands beyond the bridge are Cerrig-y-gorllwyn.