A 17-year-old boy remained in critical condition on Thursday afternoon after falling from the outside of a train onto the Sydney Harbour Bridge railway tracks. New South Wales police said he was likely taking part in train surfing when he fell from a northbound Tangara service.

Emergency crews were called at about 11.30am to the railway corridor between Wynyard and Milsons Point stations. A Careflight helicopter brought a medical team to nearby Bradfield Park as several agencies joined the rescue. NSW ambulance paramedics treated the teenager on the bridge before rescuers carried him 400 metres to safety. He was then taken by road to Royal North Shore hospital, which confirmed he had multiple injuries, including to his head, chest and pelvis.

Police transport command inspector Luke Barrett said initial evidence from CCTV and passengers indicated the boy had been hanging onto the train's exterior, an activity also known as buffer riding. Two people who had been with him were helping investigators on Thursday afternoon and had not been arrested. Barrett said the teenager had not been trapped beneath the train, describing the rescue as a “relatively straightforward extrication”. Investigations would continue over the following days.

Barrett urged people to resist social media videos that glorify riding outside trains, warning that the activity could cause severe injuries or death. He said police had seen an increase in train surfing, especially on rear carriages, during school holidays and warmer months.

Restrictions introduced in September barred passengers from rear carriages on selected Tangara services to deter people from riding on the back. Initially applied to certain weekend and night services, the measure was expanded to all Tangara trains during the school holidays. The trains operate across the eastern suburbs, Illawarra, north shore, western and northern lines, including the route between Wynyard and Milsons Point.

The NSW government announced in November 2025 that the fleet would receive specially designed nose cone attachments to prevent access to the back of trains. These devices obstruct the tread plate between carriages, an area used by people clinging to moving trains to record social media videos. Illegal buffer riding on Tangara trains has gained attention through videos shared online.

NSW has recorded 12 serious injuries from train surfing over the past five years. Those incidents include a 13-year-old boy's fall from a train at Caringbah last September. Sydney Trains acting chief executive Jas Tumbler called Thursday's fall a “really tragic incident” and expressed concern for the teenager, his family and friends. He also acknowledged the difficult task faced by responders carrying the boy several hundred metres.

Tumbler said there were about 600 train surfing incidents in 2025, compared with close to 150 so far in 2026. Although that represented a substantial reduction, he stressed that every incident posed considerable danger and could have life-changing consequences. He urged people not to pursue brief social media attention through the activity.

Transport for NSW was continuing work to equip all Tangara trains with CCTV, Tumbler said, with completion hoped for by the end of 2027. He said preventing train surfing remained a challenge despite ongoing efforts.