The works will affect trains from Monday to Thursday (September 8 to September 11).
Trains will run as normal on Friday (September 12).
We have outlined and simplified the details so you can plan your journey this weekend.
Monday to Thursday:
Engineering work is taking place between East Croydon and Oxted, closing all lines on Monday to Thursday evenings.
As a result, the 10.07pm train from London Bridge to Uckfield will terminate at Oxted.
A replacement bus will run from Oxted to Crowborough and Uckfield.
The 11.22pm train from London Victoria to East Grinstead service will not run.
Passengers should use alternative trains between London Victoria and East Croydon.
A replacement bus will run from East Croydon, calling at stations to Oxted and East Grinstead.
The 11.53pm train from London Victoria to Oxted train will terminate at East Croydon.
A replacement bus will run from East Croydon calling at stations to Oxted.