An elderly woman ended up in hospital after she was dragged along a platform when her coat got stuck in a door.
The 101-year-old had to be treated for serious injuries following the incident at on the Northern Line at Archway station in February.
She was getting off the train with a companion at around 3.50pm when the door closed, trapping her.
She was dragged along the platform for two metres before she and her companion fell to the ground, yanking the coat free.
The train continued for another 20 metres before stopping after passengers pulled the alarm and the driver, who had already realised what had happened, applied the emergency brakes.
A report from the Rail Accident Investigation Branch found that systems in the door did not detect a blockage in the door.
The RAIB has set out a series of recommendations to improve safety on London Underground after hearing about a second incident two months later.
In that case, again on the Northern Line but at Chalk Farm, a woman’s coat got stuck when she tried to get on the train as the doors were closing.
Again, the door did not detect the presence of the trapped coat. She was dragged 20 metres along the platform before the zip ripped off the jacket.
The driver was not aware of what had happened so continued to the next station.
She sustained minor injuries to her elbow and both knees and suffered psychological distress.
To get the latest news from the capital visit Metro.co.uk's London news hub.
The automatic train operating system may have contributed to both accidents, the RAIB said.
The system means the driver opens and closes the train doors, but the train is driven automatically.
In 2018, a 78-year-old woman was dragged under a train at Notting Hill Gate when her coat got stuck.
But she was unable to free herself and was pulled into the tunnel, despite being helped by others, accident investigators said.
Passengers who saw the woman in distress activated emergency alarms on the Central line train, and the driver applied the brakes.
In other tube-related news, a manhunt has been launched after a woman was pushed down the stairs and punched in the face at an east London Overground station.
Police released images of a man after a woman was pushed down the stairs before she was punched in the face.
The attack happened at Leytonstone High Road Overground station on June 2 at about 8.30pm.
Get in touch with our news team by emailing us at webnews@metro.co.uk.
For more stories like this, check our news page.
