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Officers were sent to a railway station after reports of youths trespassing on the tracks.
British Transport Police were called at 7.11pm to Chestfield and Swalecliffe.
It is understood they were joined by colleagues from Kent Police.
Up to four youths are said to have been on or near the tracks.
Officers remained on the scene for some time but it is believed the youngsters left the area.
Southeastern said services had not been stopped but drivers had been told to be cautious.