Operate started nonetheless, by having an experimental section being built 1915 by John Mowlem and Organization, who had won the bid to the development with the line. They completed the tunnels by 1917 working with the Greathead shield process, but throughout the war the stations had been put on keep due to not enough components and function about the electrical methods was suspended for security causes. The tunnels discovered a use as a shelter for paintings in the Tate Gallery and the National Portrait Gallery, but operate around the line eventually resumed in 1920, and the actual track-laying commenced 4 years later..
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