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The stormy weather has caused a landslide on the busy commuter line through Surrey, affecting thousands of passengers.
The railway on the Redhill Line out of London, near Merstham Tunnel, is blocked after the incident at around 5.20pm today - leaving thousands of passengers facing severe delays this evening.
A spokeswoman for Southern Rail said: "It affects the line between Purley in south London and Redhill, on the way out of London.
"That is our main line coming out of London so there have been knock-on delays as a result. It is going to affect a lot of people, certainly thousands.
"The cause is weather related."
Passengers travelling along the route are being advised to either get a bus from Purley or travel down to Gatwick where they can catch an alternative train to Redhill.
Network Rail has confirmed that floodwater is likely to continue to affect trackside signalling and safety equipment for some time.
In a statement, they said: "While they work to fix the problem we will only be able to run five trains an hour between Paddington and Reading in each direction. This is around a fifth of the services that would normally be scheduled.
"This will continue until Network Rail lets us know it is safe to run a full service again. We strongly advise customers not to travel unless it is absolutely necessary, and to consider alternative routes."
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More delays on the roads and rail services are expected as the south east is set to be hit by another Atlantic storm this weekend.