Ground water levels at Patcham, near Preston Park, have caused flooding of the signalling equipment with an expectation that more significant flooding will occur.
This means it has not been possible for Southern to operate a normal service today, Monday 17 February.
Instead, Southern is running a reduced alternative service with services between Haywards Heath and Brighton being diverted via Lewes.
A half hourly service is running between Hassocks and Haywards Heath, calling at Burgess Hill and Wivelsfield.
Rail replacement buses are running from Brighton to Hassocks.
Passengers for London should change at Haywards Heath.
Passengers for London from stations east of Worthing and the east coast should travel via Lewes
Passengers for London from stations west of Worthing should travel via Barnham and the Arun Valley.
For all the details please see Southern’s home page via: southernrailway