The work will affect trains from Monday (February 24) through to Friday (February 28).
We have compiled all the details on these works so that you can plan your journey this week.
Monday to Friday (February 24 to February 28):
Engineering work is taking place from approximately 11.30pm until the end of service on Monday to Thursday evenings between Balham and East Croydon, closing some lines.
From approximately 11.30pm until the end of service on Monday to Thursday evenings, stopping trains will call at alternative platforms between Balham and East Croydon.
Additionally, the 11.40pm train from London Victoria to Sutton train will be diverted to run to South Croydon.
A replacement bus will run from Selhurst to Sutton via West Croydon.
The 12.01am train on Tuesday to Friday mornings from London Bridge to Selhurst train will be diverted after Tulse Hill, calling at Crystal Palace and terminating at Norwood Junction.
A replacement bus will run from Tulse Hill to Selhurst via Streatham and Norbury.
Journey times will be increased when using replacement buses.
Monday to Thursday (February 24 to February 27):
Engineering work is taking place overnight between Redhill and Reigate, closing all lines.
From approximately 11pm until the end of service on Monday to Thursday evenings, replacement buses will run between Redhill and Reigate.
The 10.38pm and 11.08pm trains from London Victoria to Reigate trains will terminate at Redhill.
Replacement buses will run from Redhill and Reigate.
Journey times will be increased when replacing buses are used.
Monday to Friday (February 24 to February 28):
Engineering work is taking place between Lewes and Eastbourne, closing all lines overnight from Monday evening until Friday morning.
After 10pm each night until the end of service, buses will replace trains between Lewes and Eastbourne.
An amended train service will run between Eastbourne and Hastings and Ore.
