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Reuters reports:
Julia Kowalska was travelling with her sister on the network's Jubilee line when her contractions started.
She got off at Kingsbury, in north-west London, and gave birth to a healthy baby girl in the station supervisor's office, assisted by an ambulance crew.
She was taken to the nearby Northwick Park Hospital and was discharged after four days, a hospital spokeswoman said.
The other childbirth in the London Tube was recorded in 1924.