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Trains running through Sevenoaks and Tonbridge railway stations have resumed to normal service following earlier signalling problems.
Services on the Hastings line were running at a reduced speed and some were cancelled, delayed and revised.
Both London and county-bound lines were affected. Disruption lasted until 2pm.
Rail replacement buses were running between Sevenoaks and Tonbridge.
The issue has now been fixed and lines have reopened.