Teenage boy in critical condition after falling from train on Sydney Harbour Bridge

A teenage boy is in critical condition after falling from a train on the Sydney Harbour Bridge.

Emergency services were called to the rail corridor between Wynyard and Milsons Point train stations about 11:30am on Thursday.

A rescue helicopter with a medical team also landed at nearby Bradfield Park to treat the boy.

Police were told the 17-year-old fell from a train onto the tracks on the harbour bridge.

Inspector Luke Barrett, from NSW Police Transport Command, said the boy was with two others and was “hanging off the side of the train” before he fell.

“Review of CCTV and speaking to witnesses that were on board the service indicate that the male person was riding on the outside of the train, an activity which is commonly referred to as upper riding,” Inspector Barrett said.

He discouraged people from getting “caught up in the social media hype and the videos that circulate around on those social media platforms glorifying this type of activity”.

The boy was transported to Royal North Shore Hospital in a critical condition.

‘Social media fuelling this’

Sydney Trains acting chief executive Jas Tumber said train surfing “was not worth the five seconds of social media fame”.

“You just don’t mess or play with a 400 tonne train,” Mr Tumber said.

“There will always be significant consequences. And these are life-changing events that occur.

“So, you know, we’re strongly encouraging kids and also parents to intervene and just stop doing this activity … social media is fuelling this”.

Trains on the T1 North Shore line briefly stopped running between Wynyard and North Sydney.

Earlier, Transport for NSW told commuters to expect delays, with some services running 90 minutes behind schedule.

Services on the T9 Northern Line were also impacted.

Police are investigating the incident.