Here's an overview of the train services currently affected by the floods:
South West Trains running replacement bus service between Exeter St. Davids and Yeovil Junction due to landslide between Honiton and Axminster. All day.
CrossCountry between Plymouth and Bristol Temple Meads suspended due to flooding at Tiverton Parkway. No estimate for return to normal service.
Disruption to First Great Western between - London Paddington and Plymouth - Bristol Temple Meads and Plymouth - Westbury and Plymouth. Up to 2 hour delays. Very limited replacement bus service between Exeter, Taunton and Bristol. First Great Western advise passengers not to travel today.
Flooding between Swindon and Bristol Parkway. Causing disruption (up to 90 min delays) on First Great Western services between London Paddington and Cardiff Central - London Paddington and Bristol Temple Meads.