Engineering work is taking place between Tackley and Didcot Parkway, closing all lines early on Sunday morning.
As a result, the 07:53 Oxford to London Paddington will start from Didcot Parkway at 08:05.
For travel between Oxford and Didcot Parkway, you should travel by later train services.
Check before you travel:
You can plan your journey using the National Rail Enquiries Journey Planner.