This line runs from Llandudno on the North Wales Coast, through Snowdonia to Blaenau Ffestiniog.  Linear and circular walks, run by Conwy Valley and North West Wales Coast Line Community Rail Partnership.

Created by steering group member Steve Melia, this page includes downloadable gpx files for station-to-station walks in a wide radius around Bristol, including several in South Wales.  See also this article about a longer walk around the Llyn peninsula in North Wales.

A long-distance footpath runs along this line from Shrewsbury to Llanelli.  This site, run by Heart of Wales Community Rail Partnership, has gpx files of station-to-station walks along the whole line as well as short circular walks available too.

Rail Rambles run guided walks along the Heart of Wales line.

This site, run by Transport for Wales, includes descriptive information about walks from railway stations in different parts of Wales.