Tal-y-llyn Tunnel
A very early tunnel of 1812-16, part of the Hay Railway (tramway), near Llangors, Powys.[1]
Contract for the construction of the first 4.75 miles (7.7km) of the track from Brecon to Llangors Lane including tunnel through Brynderwen Bank let to Robert Tipping a miner from Newnham Glos.
1816 Opened to traffic by John Hodgkinson, engineer to Hay Railway, 1816.
1862 Enlarged and adapted for use by the Brecon and Merthyr Railway
1863 line opened
The portal resembled the mountain tunnel south of Talybont.