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Theft or vandalism could be behind signal failures on the Medway Valley line.
Trains were cancelled after an alarm alerted operators to a problem in the Yalding and Beltring area at about 2.45pm on Wednesday, June 22.
Cut cables are one possible explanation for what Network Rail called a "failure of telecommunications equipment affecting signals, cab radios and Wateringbury signal box."
Buses were running to replace cancelled services on Wednesday afternoon and an investigation is underway.