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
The mother of a barman from Somerset whose body was found washed up on the Isles of Scilly has welcomed a new police inquiry.
A school in South Gloucestershire has taken radical steps to improve Maths lessons. A teacher from Shanghai has been teaching the pupils.
The crew of a flight from Exeter Airport has been praised after the co-pilot blacked out on board.