Engineering work is taking place between Twyford and Tilehurst, closing some lines.
Trains will call at Reading slightly earlier or later than usual.
Before 17:30:
Trains from London Paddington to Oxford / Cheltenham Spa / Great Malvern / Hereford / Bristol Temple Meads / Paignton / Plymouth / Newquay / Penzance will be retimed to run up to 7 minutes earlier than usual.
Before 18:30:
Most trains to London Paddington will be retimed to arrive a few minutes later than usual.
Check before you travel:
You can plan your journey using the National Rail Enquiries Journey Planner.