Before watching this video, it helps to know that the child survived with no more damage than a cut on his forehead.  Otherwise, it would be unwatchable.  As it is, it’s a sure way to experience a gut-wrenching feeling of helplessness and despair.

The Herald Sun reports on the Closed Circuit Television footage from a train station in Melbourne, Australia, where we see a child’s pram (that’s “stroller”) roll off the platform when his mother lets go for only a second.

Kudos to the train operator who immediately employed every brake at his disposal to halt the train in just 30 meters.

The lesson: keep the stroller’s brakes on while waiting for a train.  Also: don’t build train platforms that slant inexplicably toward the track so steeply that a motionless stroller can rotate itself and roll completely off the edge before anyone can react.