7 hours ago
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The train left the tracks outside a depot near Selhurst station
Rail journeys on Southern, Thameslink and the Gatwick Express remain severely disrupted following an early morning derailment and a signal failure in south-east London.
Delays and cancellations continue on Thameslink's Bedford to Brighton line as well as the line from Stevenage to Brighton, with many trains not stopping at London Bridge.
There are also long delays for those travelling between Epsom and East Croydon on the Southern service, while there are still minor delays between Three Bridges and Horsham and London Bridge to Beckenham Junction.
Govia Thameslink Railway (GTR) apologised for the disruption, much of which is expected to continue throughout Wednesday.
Following the derailment at Selhurst and the signal failure at London Blackfriars and Norwood Junction, GTR took the decision to issue a "do not travel" alert.
Passengers were urged to avoid using the network "if at all possible" in order to manage demand for the services.
The derailed train blocked the depot, preventing other trains from leaving.
Images taken showed the train remained upright and there were no confirmed injuries.
National Rail Enquiries said the signalling fault meant fewer rail lines were available for use and trains running on the available lines had to run at slower speeds than normal.
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GTR said it was working with Network Rail to resolve the issues "as quickly as possible"
A GTR spokesperson said: "We're very sorry for the disruption that customers have experienced this morning.
"A fault with the signalling system between Norwood Junction and London Bridge, along with a train derailment at Selhurst depot, are causing the disruption.
"We're working with Network Rail to resolve these issues as quickly as possible.
"We advise customers to check our website and social media accounts for the latest travel information."
Trains from London Victoria to West Croydon are suspended until further notice.
Those planning to travel to either Gatwick Airport or Luton Airport Parkway by train are advised to allow at least an extra hour for their journey.
London Overground services have experienced knock-on delays as a result, Network Rail said.
Passengers whose journeys are disrupted are able to use tickets on certain alternative routes.
Independent rail union Transport Salaried Staffs' Association (TSSA) has called for a full explanation for the disruption.
A "do not travel order" is usually only issued in episodes of severe weather, but remained in place for almost two hours.
TSSA general secretary Maryam Eslamdoust said: "As ever our brilliant Network Rail members were at the heart of the operation to get services running again and they should be praised for their hard work in doing so.
"Our union looks at this through the lens of safety on the railways, that is and will always be the number one priority."
GTR, which also includes operator Great Northern, is the UK's largest railway franchise in terms of the number of passengers carried.
Some 18% of train journeys in the UK are made on GTR services, according to the company.
