This week planned engineering work between East Croydon and Purley will affect some late night services running between St Albans City and Sutton.
Over the weekend engineering works between New Cross and Crystal Palace will also close some lines affecting travel in and out of central London.
Some services will be running with a revised timetable or will be diverted whilst works take place.
Bus replacement services will also be running between certain stations on affected lines whilst engineering works take place next week.
Customers are being advised to check before they travel and to use alternative services to complete their journeys.
We’ve rounded up all the service changes affecting travel in south London this week.
Here’s everything you need to know:
Monday September 18 – Friday September 22
Between Monday and Friday, overnight engineering work taking place between East Croydon and Purley will close some lines.
Customers are being advised that some services will be retimed, with some journey times being extended that week.
From Monday to Thursday, engineering works taking place in Wimbledon will close some lines, affecting late night services between Sutton and St Albans City.
Between these dates the 10:07pm service from St Albans City to Sutton and the 11:19 service from Sutton to St Albans City will instead be diverted to Mitcham Junction.
Customers travelling between Sutton and Tooting via Wimbledon are being advised to use London Buses to complete their journeys.
From Tuesday until Friday, engineering works taking place between Rochester and Dartford will close some lines, affecting early morning services between Dartford and Gillingham.
Customers are being advised that buses will run in replacement of services between 12:40am and 4:10am on these days.
Saturday September 23 – Sunday September 24
Between Saturday and Sunday, engineering work taking place between New Cross Gate and Crystal Palace and West Croydon will close some lines.
This will affect travel between Peterborough, Bedford, St Albans, Cambridge, Sutton, Horsham and Brighton.
On both days, a revised Thameslink service will run between Sutton and St Albans via Wimbledon.
No Thameslink services will be running via Mitcham Junction.
Customers are being advised to use their Thameslink tickets on accepted Southern services to complete their journeys.
On Sunday, engineering work taking place in Dartford will close some lines, affecting services between St Albans City, West Hampstead Thameslink, London Bridge, Kentish Town, Dartford and Rainham and Gillingham.
On the day, an amended train service will run between Kentish Town and Plumstead, and between Gravesend and Rainham.
Customers are being advised to use their tickets for travel on Southeastern services between Plumstead and Gravesend, and on Southeastern replacement buses between Slade Green and Gravesend.