The £1.4 billion contract to run the Crossrail services has gone to Hong Kong-based MTR Corporation.
MTR beat the likes of National Express and Arriva to win the concession, which will be for eight years with an option to extend to 10 years.
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Cressida Dick said that around £700m of savings have already been made.
Tourists have been left scratching their head after the surprise announcement of the closure of the world's largest museum of oddities.
Scores of RMT union members will vote in the coming weeks on whether to launch a campaign of action.