Peter McNaught, London Underground's Operations Director, said: "London Underground has an excellent and continually improving safety record and such incidents on the Tube are very rare."
McNaught added: "We apologised fully to our customers, worked hard to resume services as soon as possible and our staff were on hand on the platform to assist those who were leaving the train. We have fully assisted the RAIB in their enquiries, as well as carrying out our own investigation.
More top news
Police say they have traced four drivers who are thought to have hit the woman, and added that a fifth vehicle may also have been involved.
Police are trying to trace two men after two homophobic attacks on gay men in Walthamstow
Two London Boroughs make it into the top 15 places to live in the UK.