The work will affect trains from March 10 through to March 14.
We have compiled all the details on these works so that you can plan your journey this week.
Engineering work is taking place overnight between Barnham and Chichester, and some lines are being closed.
Monday, Tuesday and Thursday (March 10, March 11, and March 13):
The 10.35pm train from London Victoria to Chichester train will terminate at Barnham.
A replacement bus will run from Barnham to Chichester.
Tuesday, Wednesday and Friday (March 11, March 12, and March 14):
The 4.55am train from Chichester to Brighton train will start from Barnham.
A replacement bus will run from Chichester to Barnham, departing Chichester earlier than the normal train departure time.
Journey times will be increased when using replacement buses.
Monday to Friday (March 10 to March 14):
Engineering work is taking place overnight between Oxted and East Grinstead, Crowborough, and Uckfield, closing all lines.
From approximately 10.30pm until the end of service on Monday to Thursday evenings, replacement buses will replace trains between Oxted and East Grinstead / Crowborough / Uckfield.
Journey times will be increased when using replacement buses.
Engineering work is also taking place overnight between Lewes and Seaford, finishing Friday morning, and closing some lines.
From approximately 11.30pm until the end of service on Monday to Thursday evenings, buses will replace trains between Lewes and Seaford.
Journey times will be increased when using replacement buses.
Engineering work is also taking place overnight between Redhill and Tonbridge, finishing Friday morning, closing some lines.
From approximately 11.30pm until the end of service on Monday to Thursday evenings, buses will replace trains between Redhill and Tonbridge.
Journey times will be increased when using replacement buses.
