Engineering work is taking place between Brighton and Littlehampton, closing all lines.
All day on Saturday and Sunday, buses will replace trains between Brighton and Littlehampton.
Trains that usually run between London Victoria and Littlehampton will be diverted to run between London Victoria and Brighton only.
Trains will continue to run between Littlehampton and Portsmouth Harbour / Southampton Central.
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 information, please use our travel information pages.
You can find the location of your replacement bus by checking station signs or by searching for your station on our station information pages.
Please be advised that replacement vehicles may be busier than usual, and you should allow extra time for your journey.