There's disruption on First Great Western trains between London Paddington and Bristol Temple Meads due to a trespass incident at Swindon.
It's affecting all services through Swindon. Trains may be delayed or cancelled due to congestion through the area.
Journey times may be extended by up to 45 minutes until at least 5pm.
More top news
The weather with Luke Castiglione
The weather with Luke castiglione
An eighteen metre-long dead whale which washed up on a beach in South Devon is being chopped up and removed. It's thought to cost £10,000.