The Teifi Valley Railway is a 2 ft narrow gauge railway occupying a section of the former standard gauge Great Western Railway line between Llandysul and Newcastle Emlyn. After the closure of the former line by British Rail in 1973, a preservation group built and periodically extended a narrow-gauge railway along the route, westwards from Henllan, eventually operating a 3 kilometres (1.9 mi) long line as a tourist attraction.

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.