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
[ Syn: tube , underground , subway system , subway ]
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
[ Syn: tube , underground , subway system , subway ]