The work will affect trains in the Sutton and Croydon area from Tuesday (April 22) until Thursday (April 24).
The services will not be affected on Friday (April 25).
We have outlined and simplified the details so that you can plan your trip this week.
Tuesday to Thursday (April 22 to April 24):
The engineering work is being carried out between Purley and Caterham and Tattenham Corner, closing some lines every night.
From approximately 10.45 pm to the end of the Tuesday service to Thursday night, replacement buses will be held between East Croydon, Purley, Caterham and Tattenham Worn.
Travel times can be increased when using replacement buses.
The engineering work is also being carried out between Norwood Junction and Epsom Downs, closing some lines.
At the end of the service from Monday to Thursday night, replacement buses will be held between Norwood Junction and Selhurst, and between Norwood Junction and West Croydon, Sutton, Epsom Downs.
