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 will divert between Swindon and Bristol Parkway (via Bath Spa, not calling). It will change direction of travel at Bristol Parkway, before continuing later than normal to Newport, Cardiff Central and stations to Swansea.
Check before you travel:
You can plan your journey using the National Rail Enquiries Journey Planner.