Man chases train after leaving baby on board while he smokes

Surveillance footage has captured the moment a US man chased a train after he stepped off it to have a cigarette, leaving his baby onboard as the train took off.

Video released by the Greater Cleveland Regional Transit Authority shows the man putting the child down in a carrier before getting off the train to smoke.

Soon after another passenger bangs on the window to get the man's attention as the doors close. The man then frantically chases the train for the length of the platform.

He can be seen running beside the train while another passenger stays by the baby's side and calls for help.

The pair were reunited minutes later, after the driver realised what had happened and took the train back to the station.