The changes are due to engineering work and will affect trains on Saturday and Sunday (June 14 to June 15).
We have outlined and simplified the details so you can plan your journey this weekend.
Saturday and Sunday (June 14 and June 15):
Engineering work is taking place between London Blackfriars and East Croydon or Crystal Palace, closing all lines via Sydenham.
No trains will run between London Bridge and East Croydon or Crystal Palace via Sydenham all weekend.
Replacement buses will run between London Bridge, New Cross Gate and Crystal Palace.
The following services will run to an amended timetable:
Trains between London Bridge and Caterham will be diverted to run via Peckham Rye.
Trains between London Victoria and London Bridge will run between London Victoria and Crystal Palace only.
Trains between London Victoria and Sutton or Epsom Downs.
On Saturday only, trains between East Croydon and Watford Junction will run between Clapham Junction and Watford Junction only.
Trains between London Bridge and Uckfield will run between East Croydon and Uckfield only.
Trains between London Bridge and Epsom will not run.
On Sunday, engineering work is taking place between East Croydon and Purley, closing some lines.
Until 8.30am, buses will replace trains between East Croydon, Purley, Caterham and Tattenham Corner.
