Tal-y-llyn Railway Tunnel

Railway tunnel portal of now disused railway, now blocked with breeze blocks and metal doors. Built of coursed rockfaced large stone blocks. Round arched tunnel entrance edged by a continuous course of quoins and voussoirs, each block in turn edged by a narrow flat band. Full height buttresses on either side; above arch is a plat band of tooled stone with parapet topped by rectangular coping slabs. Abutments to sides are of snecked stone and the band is rockfaced stone; no parapet. Rubble terraced retaining walls at right angles on each side. Former railway was contained in a narrow channel of coursed stone, ramped down as it approached tunnel, now filled with water.