Engineering work is taking place between London Paddington and Southall, closing some lines early on Sunday morning.
Before around 07:45, no Heathrow Express services will run between London Paddington and Heathrow Terminal 5. After this, a normal service will run.
Shuttle services between Heathrow Terminal 5 and Heathrow Terminals 2 & 3 will run every 15 minutes before 07:55.
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.