The Teifi Valley Railway was originally conceived as a  broad-gauge line between Carmarthen and Cardigan. The line was opened temporarily in 1860, under the South Wales Railway and was fully opened the following year.
A proposed railway in the Teifi Valley area was intended to be a wide-track route connecting Carmarthen and Cardigan. Initially, it was temporarily operational from 1860 under the South Wales Railway before being fully opened the next year.