Southern Railway commuters were hit with travel chaos on Monday morning because of a signalling fault at London Victoria.
The fault blocked some railway lines, forcing the company to warn of delays of up to twenty minutes and short notice platform alterations.
The issue affects all Southern services to-and-from London Victoria, including to major destinations and interchanges such as London Bridge, Gatwick Airport and Dorking.
Separately, overrunning engineering works between Horsham and Three Bridges is causing disruption to Southern and Thameslink services running between these stations. Disruption is expected until 7.30am.
On TfL, there are severe delays on the Bakerloo Line due to an earlier points failure at Lambeth North.
Follow latest updates below
Commuter Thameslink and Southern services disrupted
07:03 , Josh Salisbury
Overrunning engineering works between Horsham and Three Bridges is causing disruption to services running between these stations.
This is a popular commuter route for Southern and Thameslink users.
Services running between these stations may be cancelled, delayed by up to 30 minutes or revised, National Rail has said.
Disruption is expected until 7.30am.
Bakerloo Line severely delayed
07:00 , Josh Salisbury
On TfL, the Bakerloo Line is severely delayed.
It says this is because of an earlier points failure at Lambeth North.
There is a good service on all other TfL lines.
Southern services hit with disruption
06:58 , Josh Salisbury
A fault with the signalling system at London Victoria means that some lines are blocked.
Southern services to / from the station may be delayed by up to 20 minutes or revised.
Affected routes are: Between London Bridge and London Victoria, and also between London Victoria and Selhurst / West Croydon / Sutton / Epsom / Epsom Downs / Dorking / Reigate / Gatwick Airport / East Grinstead / Ore / Hastings / Horsham / Brighton / Havant / Littlehampton / Bognor Regis / Eastbourne / Portsmouth Harbour.
Disruption is expected until at least 7.30am.