There's disruption on First Great Western services between Gloucester and London Paddington due to a broken down train between Kemble and Swindon.
There are delays of more than 2 hours, with some trains diverting via Bristol Parkway.
Replacement buses are in place between Gloucester and Swindon. There's no current estimate for when a normal service will resume.
More top news
Around 500 people marched through the centre of Bristol protesting against government plans to bring in new contracts for junior drs.
Two students have broken the record for the youngest pair to row across the Atlantic ocean in the Talisker Whisky Atlantic Challenge.
The Environment Agency has nearly 50 red and 144 amber flood warnings in place across the country.