Engineering work is affecting First Great Western services between London Paddington and Bristol Temple Meads and Wales. An hourly service is running.
Trains are diverted via Oxford won't call at Reading or Didcot. There are buses between Swindon and Reading.
The London Paddington to Cheltenham service is also affected. Trains are only running to and from Didcot. Passengers for London should change at Oxford.
More top news
Drivers face the prospect of a standard 20mph limit on inner-city roads as part of a blitz on dangerous driving. What do you think?
A teenager was killed by her step-brother in a "violent struggle" before her body was cut up with a power saw and a knife, a court heard.
We couldn't bring you tonight's news on television because the rugby ran over - but it's all here, with Kylie Pentelow.