London was the first great city to run railways just below the surface and the first to develop a system of rapidtransit electric railways drfven • many foet below fhe surface of the streetsThere are 77- miles of single-track Tuhe tunnels, all made by.meaps of a tunnelling shield, and' lined from end to end, as the wrfrk proceeded, with cast iron rings bolted together. The lifts still in use travel between them 903 miles vertically every day—or about 330,000 miles'in a year; each making 760 trips every twenty-four hours. The deepest lift shaft—nt Hamp&tead—measures 191 ft from ton to bottom, or 20ft more than the height of the Nelson Column.
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Bibliographic details
Press, Volume LXI, Issue 18308, 16 February 1925, Page 11
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109Untitled Press, Volume LXI, Issue 18308, 16 February 1925, Page 11
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