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Noun: subway system
Usage: N. Amer
  1. An electric railway operating below the surface of the ground (usually in a city)
    "in Paris the subway system is called the ‘metro’ and in London it is called the ‘tube’ or the ‘underground’";
    - metro, tube [UK], underground [Brit], subway [N. Amer]

Derived forms: subway systems

Type of: rail, railroad [N. Amer], railroad line [N. Amer], railway [Brit, Cdn], railway line [Brit, Cdn], railway system [Brit, Cdn]

Encyclopedia: Subway system