Engineering work is taking place between Littlehampton and Barnham, closing all lines.
Buses will replace trains between Littlehampton and Barnham / Bognor Regis / Chichester.
Trains which usually run between London Victoria and Portsmouth Harbour via Horsham will be diverted to run between London Bridge and Littlehampton via Horsham.
Trains will run between Brighton and Littlehampton to an amended timetable.
Trains will also run between Chichester and Portsmouth Harbour.
No Southern trains will run between Havant and Southampton Central.
Tickets will be accepted at no extra cost on South Western Railway services between Havant / Fratton and Southampton Central.
Journey times will be increased when using replacement buses.
Check before you travel:
You can plan your journey using the National Rail Enquiries Journey Planner.
Replacement bus travel advice:
For helpful advice if you need to travel on a rail replacement service, including accessibility and bicycle information, please use our Rail Replacement Services page.
You can find the pick-up and drop-off location of rail replacement services by checking station signage or by searching for your station on our Find a Station page.
Please be advised that replacement vehicles may be busier than usual, and you should allow extra time for your journey.