The passenger is understood to have been looking out of a train door window while travelling on the Gatwick Express service on Sunday, when he suffered a blow to the head at Wandsworth Common rail station in south London.
He was pronounced dead at the scene by a doctor, who landed on the nearby common in an air ambulance, the Metro reported.
Inquiries into his death are now being carried out by British Transport Police and the Rail Accident Investigation Branch. His family have also been informed.
A spokesperson for Gatwick Express said it sent its condolences to the family and confirmed that it was co-operating with the investigation.
Passenger killed on Gatwick Express identified
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