The work will affect trains from January 13 through to January 17.
We have compiled all the details on these works so that you can plan your journey this week.
Monday to Wednesday (January 13 to January 15)
The 11.25pm train from London Victoria to Brighton service will be diverted after Haywards Heath to run to Brighton via Lewes.
It will not call at Burgess Hill or Hassocks and will arrive at Brighton later than usual.
A replacement bus will run from Haywards Heath to Brighton, calling at Burgess Hill and Hassocks.
Tuesday to Thursday (January 14 to January 16)
The 12.02am train from London Victoria to Worthing train will terminate at Three Bridges.
A replacement bus will run from Three Bridges to Brighton, and from Brighton to Worthing.
The 1.08am train from Haywards Heath to Eastbourne service will be replaced by a bus.
