Police in Christchurch have released the name of the teenager struck by a train and killed near Belfast on Monday night.
He was Jayden John Smith, 16, from Christchurch.
Detective Sergeant Richard Quested says inquiries into the death continued on Tuesday, including interviews with witnesses and the two people who were with the teen at the time of the incident.
Mr Quested says police are satisfied there are no suspicious circumstances and the death will be referred to the coroner.