Akademik

subway system
noun
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: ↑metro, ↑tube, ↑underground, ↑subway
Hypernyms: ↑railway, ↑railroad, ↑railroad line, ↑railway line, ↑railway system

Useful english dictionary. 2012.