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Anti-social behaviour described by police as "absolutely unacceptable" has prompted a crackdown on crime at several Kent train stations.
Officers from British Transport Police will be out in force after reports of people spitting and smoking at stops on the Medway Valley line.
Half a dozen youngsters have already been banned from entering the station at Halling for a period of 48 hours.
Meanwhile at Strood, officers dealt with two passengers, one of whom had been seen spitting and the other had been reported for smoking.
Another person was spoken to at Aylesford station for possession of cannabis.
Insp Ed Walden from British Transport Police said: "This sort of behaviour is absolutely unacceptable and makes people feel uncomfortable and unsafe in what is otherwise a very safe environment.
"Crime at these stations is low, however our priority is to make sure that people who use the rail network are not only safe but feel safe."
A spokesman for Southeastern said it was working with British Transport Police "to make the railways as safe as possible".