The southwest peninsula has had a continuous coast path since 1978.  There are 22 stations along it, with a few stretches short enough to walk in a day.  

The Exe Explorer Leaflet, on this web page, describes the Exe Estuary Trail, which runs along the the Exe Estuary, served by the Avocet Line, from Exeter to Exmouth.

Walks along the branch lines in Devon and Cornwall (linear and circular), with downloadable instructions.  This site is run by the Devon and Cornwall Community Rail Partnership.  

Created by steering group member Steve Melia, this page includes downloadable gpx files for station-to-station walks (and some involving buses) in a wide radius around Bristol.

Walks from and between the stations along the Severn Beach Line from Bristol (linear and circular).  Run by the Friends of Bristol Suburban Railways. 

Walks from the stations in Dorset, linear and circular.  Some of them return by bus.

This web page has three rail walks in Devon and information about others in other parts of the country.

A wide range of circular walks from Pewsey and Bedwyn stations.  Downloadable pdf files include maps and detailed descriptions.

This website has detailed information on hundreds of walks around the country, including several in Southwest England. (Linear and circular)

Take a healthy walk

What could be better for the mind body and soul than to catch a train and enjoy a scenic walk?

The Wessex Wanderers lead guided group walks from stations on the line between Bristol and Weymouth.