Operate began nonetheless, having an experimental area becoming constructed 1915 by John Mowlem and Firm, who experienced won the bid to the construction in the line. They finished the tunnels by 1917 applying the Greathead shield technique, but through the war the stations were put on maintain as a consequence of insufficient supplies and operate within the electrical systems was suspended for safety factors. The tunnels discovered a use like a shelter for paintings through the Tate Gallery and also the National Portrait Gallery, but operate about the line sooner or later resumed in 1920, and the real track-laying commenced 4 many years later..
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