A points failure is causing disruption on the railway in Sussex this afternoon (May 13).
Southern Rail said: "A points failure near Wivelsfield is causing disruption to trains between Haywards Heath and Brighton/Lewes.
"We anticipate disruption will continue until approximately 3.30pm.
"Journey times are being extended considerably between Haywards Heath and Brighton/Lewes. If you are travelling between these stations you are advised to delay travelling until later where possible."
The rail operator said trains are unable to run between Haywards Heath and Brighton/Lewes.
But rail services between Brighton and Lewes are not affected.