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 UK's first "number two" bus is to hit the road powered entirely by human and food waste.
The number of people seeking help with mental health issues after they leave the armed forces is rising here in the West Country.