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A bird flies above an Underground sign at one of the entrances to King's Cross tube station in London, Friday, March 12, 2021. Even as many of its famous institutions closed during the coronavirus pandemic for most of the past 12 months, London's Underground kept running through three successive lockdowns. Nicknamed the Tube, its staff from cleaners to train drivers take pride in maintaining a system that keeps London's heart beating. (AP Photo/Alastair Grant)

A bird flies above an Underground sign at one of the entrances to King's Cross tube station in London, Friday, March 12, 2021. Even as many of its famous institutions closed during the coronavirus pandemic for most of the past 12 months, London's Underground kept running through three successive lockdowns. Nicknamed the Tube, its staff from cleaners to train drivers take pride in maintaining a system that keeps London's heart beating. (AP Photo/Alastair Grant)

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