Rail passengers are experiencing delays of up to an hour due to a signalling problem.
A signalling problem at Templecombe railway station has caused severe disruption on South West Trains routes to London and Exeter.
Until further notice trains from Exeter St Davids to London Waterloo are being diverted at Yeovil Junction and will not stop at Sherborne, Templecombe, Gillingham and Tisbury stations.
Delays are affecting Axminster, Crewkerne and Yeovil Junction stations.
Buses are running between Yeovil Junction and Salisbury to connect with services to London.
Tickets may be used on First Great Western services between Exeter and London Paddington and between Yeovil Pen Mill and Salisbury via Westbury.
For live updates search #Templecombe on Twitter or call TrainTracker on 0871 200 49 50.