There's disruption on First Great Western trains between Bristol Temple Meads and London Paddington due to a signalling problem between Chippenham and Swindon.
Cancellations and delays of up to 30 minutes can be expected.
Some services are diverting and not calling at Bath Spa and Chippenham. First Great Western is looking to source replacement road transport for passengers at these stations.
More top news
A new film celebrating life in Somerset will have its premiere in Taunton tonight. It was shot on film which was developed using cider.
A charity which was set up in memory of 17 year-old Lloyd Fouracre - who was killed on a night out - is celebrating its 10th anniversary.
A Royal Navy sailor from Gloucestershire is one of four men who's been accused of raping a woman in Canada after an ice hockey tournament.