Detectives are appealing for witnesses following a violent incident close to Aylesham station.
On 31 October at around 10.20pm, there was a disturbance at the station involving a large group of people.
A 20-year-old man sustained a serious injury and was taken to hospital for treatment.
A 16-year-old boy was arrested on suspicion of Grievous Bodily Harm later that evening. He has been released on police bail.
Anyone with information can contact BTP by texting 61016 or calling 0800 40 50 40 quoting reference 719 of 31/10/20.
Alternatively you can call Crimestoppers anonymously on 0800 555 111.