Heavy rain has flooded the railway between Bristol Parkway and Swindon and also between Chippenham and Swindon, closing all lines.
Trains may be cancelled or delayed by up to 60 minutes.
Disruption is expected until 12:00.
Customer advice:
Flooding is also affecting the alternative routes which would have been used to divert services. You are advised to not attempt to travel at this time.
Additional information:
Network Rail staff are on their way to inspect the lines.
Check before you travel:
You can check your journey using the National Rail Enquiries real-time Journey Planner.
âââââââCompensation:
You may be entitled to compensation if you experience a delay in completing your journey today. Please keep your train ticket and make a note of your journey, as both will be required to support any claim.