A 15-month-old baby escaped with just cuts and bruises after being hit by a train when his pushchair rolled off a station platform.

CCTV footage shows the buggy, at the top of the picture, rolling onto the track as the train arrives at Melbourne's Tooronga station.

Paramedics said the double-pushchair started moving after the baby's three-year-old brother climbed out when their grandmother's back was turned.

Ambulance crew member Kate Jessop said it was amazing the child was not seriously hurt, while the grandmother, who was not named, told of her fear for the baby.

A similar incident happened in October, also in Melbourne, when a baby escaped with just a bump on the head.