Train services at Haywards Heath railway station are disrupted this afternoon due to a fault with the signalling system, Southern has said.
Trains are not running through Platform 1 because of the fault.
A spokesman for Southern said: “I can confirm that we are currently unable to run trains through Platform 1 at Haywards Heath because of a fault with a set of points near the station.
“Unfortunately we have had to cancel one train, and three further services have had to be terminated early.
“Other trains have been delayed as a knock-on effect and disruption is expected until around 5.00pm.”
Passengers are encouraged to claim compensation if their journey has been delayed by 15 minutes or more.