Video of a near-death attempt to cross the tracks has been released by Network Rail.
The footage shows a 14-year-old boy at Cross Keys station in Wales from May this year running in front of a train and jumping on to a platform and trying to board it.
The angry driver leaves the station without him. He was cautioned by police.
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Teenagers, aged 13 and 14, were taken to hospital on Friday morning but passed away, South Yorkshire Police said.
Eleven people remain in hospital.
The 22-year-old wore the full uniform, including hairnet, in Middlesbrough.