A bridge has been damaged between Wimbledon and Tooting meaning all lines are closed.
Trains running between Wimbledon and Streatham may be cancelled, delayed by up to 30 minutes or revised.
Trains will not call at Haydons Road and Tooting.
Disruption is expected until 3pm.
Stay tuned for the latest on air travel news.
Customer advice from Thameslink.
Thameslink services are unable to run between in either direction between Wimbledon and Tooting. This is affecting the route between Sutton and St Albans.
Some trains which run via Tooting will be diverted. They will run between Sutton and St Albans via Mitcham Junction instead. After Sutton, these trains will continue to Wimbledon. They will return to Sutton from there, before heading back to St Albans. Other trains from St Albans may terminate at Herne Hill, instead of continuing through to Sutton, and they will return back to St Albans from there. Because of these changes, trains will not serve the route via Tooting or Haydons Road until this issue is resolved. There will also be a reduced service at West Sutton, Sutton Common, St Helier, Morden South, South Merton, Wimbledon Chase and Wimbledon.
Getting to your destination: You may need to use an alternative route to get to your destination. It is recommended you leave at least 30 minutes of extra time to do this. This will depend on the exact journey you’re making. Your ticket will be accepted at no extra cost on:
Southern services between Sutton, West Croydon or East Croydon and the London area
Alternative Thameslink services between East Croydon and London Blackfriars
South Western Railway services between Wimbledon and London Waterloo (some of these services are also disrupted)
Southeastern services between Herne Hill and London Victoria
London Trams between East Croydon, West Croydon, Mitcham Junction and Wimbledon
London Buses between Sutton and Wimbledon, as well as buses as far as Central London
London Underground services on any reasonable route, including services on the Northern Line via the Tooting area and as far as Morden, and the District Line to & from Wimbledon