This is the heart-stopping moment a toddler was saved by a hero commuter after falling onto a railway line – seconds before a high-speed train thundered past. CCTV footage captured the dramatic near-miss at Newark Northgate railway station last month. The 36-second clip shows the three-year-old boy walking behind two adults before running to the edge of the platform. He appears to lower himself over the edge before tumbling backwards onto the track. A man who was with the child is seen sprinting across the platform while a hero bystander leaps onto the line and lifts the boy to safety. Just 22…