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A train was stopped last night so two teenagers could be arrested.
British Transport Police boarded the service at Tonbridge station after reports a 61-year-old man had been assaulted on board a train travelling between Crowhurst and Battle.
Two boys, aged 16 and 17 from Lambeth, London, were arrested on suspicion of grievous bodily harm.
Officers drew tasers during the arrest, but did not fire them.
The teenagers have been taken to police custody where they remain as inquiries continue.
A British Transport Police spokesman said: "The victim is not believed to be seriously injured."
Anyone with any information is asked to contact BTP by sending a text to 61016 or by calling 0800 405040 quoting reference 431 of September 27, 2017.
Alternatively, ring Crimestoppers anonymously on 0800 555 111.