There are delays of up to one hour on South West Trains between Exeter St Davids and Salisbury due to signalling problem between Crewkerne and Yeovil Junction.
More top news
More than 150 boats are taking part in the World Pilot Gig Championships - the biggest in its 27 year history.
A minute's applause will take place during the Army-Navy rugby match in memory of Captain David Seath, who died during the marathon.
RNLI lifeguards will start patrolling beaches in the region this weekend as the 2016 summer season get underway.