Flooding is causing further delays on the trains near Gatwick this morning.
Delays of up to 20 minutes are being reported after signals were damaged by flood waters at Merstham near Gatwick.
Some trains are being diverted to alternate lines.
It comes after a section of the Brighton Mainline was shut following flooding near Patcham.
Southern currently don't have an estimate for when normal service will resume.
More to come.