The teenager was arrested after an employee at Bromley South Station was attacked Monday afternoon.
The railroad employee had to be hospitalized for injuries sustained in the attack
A UK spokesman Traffic police told MyLondon that a member of staff had been taken to a nearby hospital.
They said: “The UK traffic police were called to Bromley South Station at 1:09 pm on May 31st after reports that a Railroad personnel had been attacked.
Thameslink tweeted: “The police are dealing with an incident in Bromley South, which means that the station is only being vacated at the moment.
The passengers were unable to get to the station board trains as the local bus routes accepted tickets.