Rail services have been disrupted across the county due to electrical supply problems and reports of trespassers on the line.
Southeastern is unable to run a service between Otford and Ashford International via Maidstone East.
It follows an electrical problem near Kemsing which is causing knock-on delays.
Trains are being diverted via Sevenoaks and Paddock Wood.
Southeastern says it has requested rail replacement buses however they are not expected to be available until before 10pm.
London-bound trains are unaffected, the rail operator says.
Elsewhere, trains have also come to a halt in Thanet following reports of a trespasser on the line near Ramsgate.
Southeastern said at 8.40pm the trespasser had been apprehended and services should resumed shortly.
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