The changes are due to engineering work and will affect trains from Monday to Thursday (August 4 to August 7).
Trains on Friday (August 8) will run as normal.
We have outlined and simplified the details so you can plan your journey this week.
Monday to Thursday (August 4 to August 7):
Engineering work is taking place between Brighton and Worthing, closing all lines.
After 11.30pm each night, buses will replace trains between Brighton and Worthing and West Worthing.
Trains that normally run between London Victoria and Worthing will be diverted to terminate at Brighton instead of Worthing.
Additionally, the 10.20pm train from Southampton Central to Brighton train will not call at Southwick or Portslade.
A replacement bus will run from Worthing to Brighton, calling at these stations.
The 10.52pm train from Portsmouth Harbour to Brighton train will terminate at Littlehampton.
A replacement bus will run from Littlehampton to Brighton, departing at 11.53pm and calling at all stations.
Wednesday and Thursday (August 6 and August 7):
Engineering work is taking place between Hastings and Ashford International, closing all lines on Wednesday and Thursday evenings.
After 11pm each night, buses will replace trains between Hastings and Ore and Ashford International.
