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Trains are severely disrupted after a signal failure led to delays and cancellations.
The issue, at Gillingham Railway Station, services are being delayed by up to 20 minutes while those on the Sole Street line have been suspended.
Tickets for this line are instead valid on Arriva 101, 132 and 182 buses, high-speed services via Gravesend and tubes between London terminals.
The train operator said services may be revised or cancelled between St Pancras to Faversham, Victoria to Gillingham, Victoria to Dover Priory and Victoria to Ramsgate.
If your journey is delayed by 15 minutes or more you can claim Delay Repay compensation.