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Commuters are being warned of potential travel chaos tonight on train services travelling via Gravesend.
Services from London Victoria and London Charing Cross may be cancelled, revised or delayed because of a fault with the signalling system.
Southeastern warned customers on its website the disruption is set to continue for the rest of the day - with urgent repairs being carried out tonight.
Staff made a temporary fix earlier to allow trains to run through Gravesend, but are unable to use platform zero.
Services that run between London Charing Cross and Gravesend will run between London Charing Cross and Northfleet only.
Trains between London Victoria and Gravesend will run between London Victoria and Dartford only.
All other services can run through Gravesend but will experience delays, and may be amended at short notice.
Customers can use Fastrack buses between Dartford, Ebbsfleet and Gravesend at no extra cost and Thameslink services between Dartford and Rainham.
Passengers are advised to allow extra time for their journey this evening.
Read more: All the latest news from Gravesend
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