The service from Brighton to Seaford has been disrupted because of the problem, and those travelling are being advised to check for cancellations or delays before they travel.
There are no other problems on the rails this morning.
Roads across Sussex are clear and there are no reported congestion spots.
Temporary traffic lights are still in place on Uckfield High Street and the B2113 Keymer Road in Burgess Hill.
The Ringmer Steam and Country show is also taking place this weekend, which could cause traffic to build up at Broyle Slide on the B2192.
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