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
University lecturers across the region have walked out in a two-day strike over plans to end their defined benefit pensions
Cloud will arrive as we head towards the afternoon but staying mostly dry.
A chilly and possibly frosty start to the day but it will be staying mostly dry.