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.
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A blustery start to the day will be followed by rain as the morning progresses.
A wet and windy start for many areas, with some heavy rain at times.
Cloud will thicken and rain will strengthen in the early hours, creating a blustery night.