From The Collaborative International Dictionary of English v.0.48:

Subway \Sub"way`\, n.
   1. An underground way or gallery; especially, a passage under
      a street, in which water mains, gas mains, telegraph
      wires, etc., are conducted.
      [1913 Webster]

   2. An underground railroad, usually having trains powered by
      electricity provided by an electric line running through
      the underground tunnel. It is usually confined to the
      center portion of cities; -- called also tube, and in
      Britain, underground. In certain other countries (as in
      France or Russia) it is called the metro.
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