The Llangurig branch was a part of a proposed scheme by the Manchester and Milford Railway (M&MR) to connect industrialised Northwest England with the West Wales deep water port of Milford Haven. After various financial and construction difficulties, the 1.5 miles (2.4 km) of the Llangurig branch is noted as being the shortest lived working branch line in the United Kingdom, receiving only one train.

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.