Commuters are facing disruption to rail services following a points failure.
Trains running to and from Eastbourne may be delayed, revised or even cancelled due to the fault.
The disruption is expected to last until later this morning.
Passengers have warned that their journey may be delayed by up to 30 minutes and have been urged to check journey planners and information boards before they travel.
A spokeswoman for Southern Rail said: “Points are moveable sections of track that allow trains to be routed to their destination.
“In this case, trains are being disrupted by a fault with points at Eastbourne sidings.
“Network Rail teams are on site and investigating the fault.”
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