There are delays and cancellations on First Great Western services between London Paddington and Reading after a person was hit by a train. Some lines are blocked and other trains could be cancelled while emergency crews are on site.
It could add 30 minutes to journeys and will affect travel times to and from the westcountry.
More top news
A coroner has ruled there is "no sufficient cause to resume an inquest" into the death of murdered honeymooner Anni Dewani.
How did the Weston Beach Race become one of the UK's biggest off-road races?
The fourth batch of Bristol Shauns are rolled out at The Grand Appeal auction.