The work will be carried out from Monday to Friday (April 28 to May 2).
We have outlined and simplified the details so you can plan your journey.
Monday to Friday (April 28 to May 2):
At the end of service on Monday to Thursday evenings and Tuesday to Friday mornings, some lines between London Bridge and Norwood Junction will be closed.
The 12.17am train from London Bridge to Caterham train will be diverted between London Bridge and Norwood Junction and will run later than usual.
The 12.35am train from London Bridge to East Croydon train will be diverted between London Bridge and Norwood Junction and will run later than usual.
A replacement bus will run from London Bridge to Norwood Junction via Sydenham.
Journey times will be increased when using replacement buses.
Engineering work is also taking place between Selhurst and Balcombe, closing some lines overnight.
From approximately 11.15pm on Monday to Thursday evenings to 5.30am on Tuesday to Friday mornings, trains will run to an amended timetable with extended journey times between East Croydon and Haywards Heath.
Engineering work will also be taking place overnight between London Victoria and Clapham Junction, closing some lines.
From 11.45pm on Monday to Thursday evenings and until 5.15am on Tuesday to Friday mornings, trains will run to an amended timetable with extended journey times between London Victoria and Clapham Junction
