Rail passengers are facing delays of up to 10 minutes due to a signalling problem near Wivelsfield.
The delays are affecting passengers travelling between Brighton, Hove, Lewes and Haywards Heath.
There is no current estimate for when a normal service will resume.
For all the latets traffic and travel news visit http://www.theargus.co.uk/li/traffic_and_travel.in.Brighton/
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