Tal-y-llyn Railway Tunnel

The Tal-y-llyn Railway Tunnel is a railway tunnel portal from a now disused railway, which is currently blocked with breeze blocks and metal doors. It is constructed from large, coursed rockfaced stone blocks. The entrance features a round arch, bordered by a continuous course of quoins and voussoirs, with each block edged by a narrow flat band. There are full-height buttresses on either side of the entrance. Above the arch, there is a plat band made of tooled stone, with a parapet that is topped by rectangular coping slabs. The abutments on the sides are made of snecked stone, and the band is rockfaced stone without a parapet. On each side, there are rubble terraced retaining walls that are positioned at right angles. The former railway was situated in a narrow channel of coursed stone that ramped down as it approached the tunnel, which is now filled with water.