The images taken from CCTV footage also show the child’s mother going on to the tracks to carry baby and buggy to safety.
Moments before, the man with the mother had left the buggy at the bottom of the stairs at Goodge Street station in north London while the couple went to assist other family members.
But a strong gust of wind blew the unattended buggy carrying the child onto the tracks with a train moments from arriving.
The buggy can be seen precariously rolling towards the tracks. After realising what happened, the child’s panic-stricken mother rushed on to the tracks to carry the baby back on to the platform.
Police are now attempting to trace the couple involved in the incident on the evening of July 23 to ensure the child did not suffer any injuries.
“This was a frightening incident, not just for the scale of the danger the child was exposed to, but also because the woman then put her own life on the line by going onto the tracks,” BTP chief inspector Mark Lawrie said.
“We urgently need to identify the people involved to ensure the child wasn’t injured.”