A railway bridge tunnel is flooded following heavy rainfall.
Trains are delayed between Three Bridges and Haywards Heath due to flooding.
Track specialists are on their way to Balcombe Tunnel to assess how bad the flooding is.
Southern Rail recommends that commuters allow an extra 15 minutes for travel.
Tickets are being accepted on Metro Bus between Three Bridges and Brighton while services are affected.
Another update confirmed the flooding was not "as bad as initially reported".
Engineers are inspecting the line to see if water is draining properly.
Trains will run through the area at a reduced speed.
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