A baby is lucky to be alive after the doors of a packed London Underground train opened while it was travelling between stations.
The baby's buggy was near two doors when they opened on the Piccadilly line on Sunday.
The driver was alerted by an alarm in the cab and hit the brakes to stop the train, before rushing into the carriages to see if passengers were safe.
The operator tried to push the doors shut but they sprang wide open and had to be closed by a control in the cab.
Metro reports that the Rail Maritime and Transport union has called for an investigation.
RMT general secretary Bob Crow said: "Clearly, there now needs to be a formal and detailed investigation conducted at the highest level as this is not the first time our members have reported door malfunctions on the ageing Piccadilly line fleet."
Speaking to the Evening Standard, Nigel Holness, London Underground's Operations Director, said: "Safety systems immediately alerted our train operator after a Piccadilly line train travelling to Heathrow on Sunday was found to have two doors slightly open.
"The operator brought the train to a halt, checked the doors and ensured they could be fully closed before the train was taken to the next station where it was taken out of service.
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