The disruption is expected to last for hours.
Commuters have been hit by disruption in London this morning after a signal fault.
Passengers using the route between Highbury and Islington to New Cross Gate and West Croydon have been hit by delays this morning.
Both London Overground and National Rail services are affected after a fault with the signalling system at West Croydon which is expected to wreak havoc for hours.
Transport for London (TfL) said part of the Overground is suspended.
Rail passengers were told to prepare for cancellations or delays of up to 30 minutes.
Some services may be revised to terminate at New Cross Gate or diverted to Crystal Palace, National Rail warned.
The disruption is expected to last at least until 1pm.
London Overground
Route between Highbury & Islington / New Cross Gate and West Croydon.
Trains will not call at all stations between West Croydon and Sydenham, Transport for London said.
Tickets could be used on local buses via any reasonable route.
National Rail
Southern services will be delayed or have alterations due to a signalling issue in the West Croydon area.
Thameslink services in the area are also delayed, National Rail said.
Services between Epsom and London Bridge will run only hourly instead of half-hourly.
• London Victoria to/from Epsom Downs will have a reduction in services, only running hourly instead of half-hourly
• Other Southern services running in the ‘Metro’ area (between London Bridge and London Victoria) are being delayed by up to 15 minutes.
Journeys will be delayed by up to 30 minutes on routes between Epsom and London Bridge, and London Victoria and Epsom Downs, and you may need to wait for the next available service if your original train has been cancelled.
Southern customers can use their tickets for no extra cost on other Southern services.
There is also some disruption on the Northern Line this morning.
Part of the line between Golders Green and Edgware is suspended because of ‘a fire alert at Colindale,’ TfL said.
Have you been affected by the disruption? Please email noora.mykkanen@metro.co.uk.
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