Thameslink train users are urged to check travel plans if travelling towards or from London Blackfriars this week.
From Tuesday, January 30, to Friday, February 2, engineering work will take place between Herne Hill and London Blackfriars.
Before 5am on those days, services will start and terminate at Herne Hill.
Tickets will be accepted on London Buses between Sutton and London Blackfriars and on London Trams between East Croydon and Wimbledon.
You can plan your journey using the National Rail Enquiries Journey Planner or plan your journey on London Buses and London Trams by using the Transport for London Journey Planner