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.
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The whole region staying clear overnight with warm temperatures.
Temperatures remain high up to 12C inland.
Until now the ground has just been too waterlogged to let them out to graze.