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.

Newcastle Emlyn is a town on the River Teifi, straddling the counties of Ceredigion and Carmarthenshire in West Wales. It is also a community entirely within Carmarthenshire, bordered by those of Llangeler and Cenarth, also in Carmarthenshire, and by Llandyfriog in Ceredigion. Adpar is the part of town on the Ceredigion side of the River Teifi. It was formerly called Trefhedyn and was an ancient Welsh borough in its own right. The area including Adpar had a population of 1,883 according to the 2011 census.