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Britain's Queen Elizabeth II unveils a plaque to mark the Elizabeth line's official opening at Paddington station in London, Tuesday May 17, 2022, to mark the completion of London's Crossrail project. (Andrew Matthews/Pool via AP)

Britain's Queen Elizabeth II unveils a plaque to mark the Elizabeth line's official opening at Paddington station in London, Tuesday May 17, 2022, to mark the completion of London's Crossrail project. (Andrew Matthews/Pool via AP)

Britain's Queen Elizabeth II at Paddington station in London, Tuesday May 17, 2022, to mark the completion of London's Crossrail project. (Andrew Matthews/Pool via AP)

Britain's Queen Elizabeth II at Paddington station in London, Tuesday May 17, 2022, to mark the completion of London's Crossrail project. (Andrew Matthews/Pool via AP)

Britain's Prime Minister Boris Johnson gives a speech at Paddington Station in London, as Mayor of London Sadiq Khan looks on, to mark the completion of London's Crossrail project, Tuesday May 17, 2022. (Andrew Matthews/Pool via AP)

Britain's Prime Minister Boris Johnson gives a speech at Paddington Station in London, as Mayor of London Sadiq Khan looks on, to mark the completion of London's Crossrail project, Tuesday May 17, 2022. (Andrew Matthews/Pool via AP)

Britain's Queen Elizabeth II at Paddington station in London, Tuesday May 17, 2022, to mark the completion of London's Crossrail project. (Andrew Matthews/Pool via AP)

Britain's Queen Elizabeth II at Paddington station in London, Tuesday May 17, 2022, to mark the completion of London's Crossrail project. (Andrew Matthews/Pool via AP)

Britain's Queen Elizabeth II and Prince Edward, right, talks with Transport for London commissioner Andy Byford, left, at Paddington station in London meets staff of the Crossrail project, as well as Elizabeth Line staff who will be running the railway, to mark the completion of London's Crossrail project, Tuesday, May 17, 2022. (Andrew Matthews/Pool via AP)

Britain's Queen Elizabeth II and Prince Edward, right, talks with Transport for London commissioner Andy Byford, left, at Paddington station in London meets staff of the Crossrail project, as well as Elizabeth Line staff who will be running the railway, to mark the completion of London's Crossrail project, Tuesday, May 17, 2022. (Andrew Matthews/Pool via AP)

Britain's Queen Elizabeth II at Paddington station in London, Tuesday May 17, 2022, to mark the completion of London's Crossrail project. (Andrew Matthews/Pool via AP)

Britain's Queen Elizabeth II at Paddington station in London, Tuesday May 17, 2022, to mark the completion of London's Crossrail project. (Andrew Matthews/Pool via AP)

Britain's Queen Elizabeth II at Paddington station in London, Tuesday May 17, 2022, to mark the completion of London's Crossrail project. (Andrew Matthews/Pool via AP)

Britain's Queen Elizabeth II at Paddington station in London, Tuesday May 17, 2022, to mark the completion of London's Crossrail project. (Andrew Matthews/Pool via AP)

Britain's Queen Elizabeth II unveils a plaque to mark the Elizabeth line's official opening at Paddington station in London, Tuesday May 17, 2022, to mark the completion of London's Crossrail project. (Andrew Matthews/Pool via AP)

Britain's Queen Elizabeth II unveils a plaque to mark the Elizabeth line's official opening at Paddington station in London, Tuesday May 17, 2022, to mark the completion of London's Crossrail project. (Andrew Matthews/Pool via AP)

Britain's Queen Elizabeth II meets staff who have been key to the Crossrail project, as well as Elizabeth Line staff who will be running the railway, including apprentices, drivers, and station staff at Paddington station in London, to mark the completion of London's Crossrail project, Tuesday, May 17, 2022. (Andrew Matthews/PA via AP)

Britain's Queen Elizabeth II meets staff who have been key to the Crossrail project, as well as Elizabeth Line staff who will be running the railway, including apprentices, drivers, and station staff at Paddington station in London, to mark the completion of London's Crossrail project, Tuesday, May 17, 2022. (Andrew Matthews/PA via AP)