Engineering work is taking place between Swindon and Bristol Parkway, closing all lines on Monday to Thursday evenings.
As a result, the 22:49 London Paddington to Swansea service will be diverted after Swindon, and will call at Bristol Parkway and stations beyond later than usual.
Check before you travel:
These changes are not currently shown in the National Rail Enquiries Journey Planner, please check back nearer to the time of travel.