An adult man is in hospital after going underneath a C-Train at 7th Avenue and Centre Street downtown.
For reasons unknown, the man was hanging onto the mirror of the train when he lost his grip and slipped underneath.
It happened just after 3 p.m Tuesday afternoon and took about an hour before crews could lift up the train to release the man.
He remains in hospital in life-threatening condition.
Calgary Transit was reporting significant delays Tuesday afternoon as a result of the incident.
Calgary police continue to investigate.