The Gwili Railway is a Welsh heritage railway, that operates a preserved standard gauge railway line from the site of Abergwili Junction in southwest Wales along a four-and-a-half-mile (7.2 km) section of the former Carmarthen to Aberystwyth line. The original railway closed in 1965, with the track being lifted in 1975.

The Carmarthen and Cardigan Railway was a 7 ft 1⁄4 in broad gauge railway line in Wales that was intended to connect Carmarthen on the South Wales Railway with Cardigan. In fact, it was unable to raise the necessary capital and was loss-making from the time of opening the first short section of its line in 1860, and it was in receivership for much of its life. It eventually reached Llandysul in 1864 but was not extended further during its independent existence.