A 15-month-old boy escaped with just a few cuts and bruises today after his pushchair rolled on to a railway track in Australia and was hit by a train.

The incident happened when the baby's grandmother looked away for a moment.

Security camera footage shows the pushchair rolling over the edge of the platform just as the train pulls into the station.

It was pushed a short distance down the tracks before the train came to a halt.

The dramatic escape came just seven months after another baby in the southern city of Melbourne survived a train striking his buggy, which had also rolled on to the tracks.

Paramedic Kate Jessop said officials were amazed the child in today's incident survived.

"It's absolutely amazing that this child isn't more injured than what he is, given the circumstances of the accident," Ms Jessop told reporters. "It would appear, amazingly, that it's nothing more than a couple of grazes and a big fright.

"I was assuming the worst as well and had those awful pictures in my head of a child underneath the train."

The baby and his three-year-old brother were being cared for by their grandmother. She told officials she looked away for a moment, and turned back to see the pushchair on the track, Ms Jessop said.

Officials have not released the name of the grandmother, and paramedics said she was too distraught to talk.

The boy was in stable condition at the Royal Children's Hospital in Melbourne. He suffered some minor facial bruising and grazes to his head, but otherwise appeared fine, Ms Jessop added.

Last October, a six-month-old baby survived after his buggy rolled on to the tracks when his mother let go for an instant.

Security footage of that escape showed the pushchair plunging off a station platform as a commuter train pulls in, and his mother's desperate lunge to grab it. The baby suffered only a bump on the head.