A woman was pushing her child in the buggy along the platform while looking up at the board that indicates when the next train will arrive.
“She didn’t realise how near she was to the edge of the platform and accidentally pushed the buggy wheels over it,”said a statement from the British Transport Police.
The child’s father also took shelter as the train passed overhead, after jumping down to help them on Friday evening at Baker Street Tube station.
“Amazingly none of them were seriously hurt, but as a precaution they were taken to hospital for check-ups,” the statement said.
“She, the buggy and the child fell onto the track. The father jumped down to help them.
“When they saw a train coming, all three were extremely fortunate in being able to move into a pit under the track and the train passed safely over the top of them.”
An estimated 1.37 billion passengers travel on the Tube each year, and in 2017 more than 3,000 injuries were recorded, according to figures from the Transport for London operating body.
Nigel Holness, director of network operations at Transport for London, said he was “relieved” the family was unharmed but emphasised the need for travellers to stand back from the platform edge.