The Tarka Line - which connects Exeter to Barnstaple, via Crediton - remains closed following bad weather and flooding, which may have affected the foundations of the track. Network Rail reports that train services are cancelled and that a replacement bus service is running instead.
An inspection by helicopter took place on Thursday this week and will be followed up by a walk-through along the track.
Peter Craske, spokesman for the Tarka Rail Association, told ThisIsDevon "The lines will be inspected by Network Rail tomorrow [Sunday 30 December]" and explained that there have been issues with ballast being washed out from beneath the tracks.
Commenting on the operator of the line, he said "First Great Western are doing a good job of keeping people informed via their website" and emphasised that "We haven't seen disruption like this in living memory."
The Tarka Line is named after Tarka the Otter, from the book by Henry Williamson.