Metrophile (A person with a devoted interest in these systems) .
External links
UrbanRail.Net (http://www.urbanrail.net) (formerly called metroPlanet) – descriptions of all metro systems in the world, each with a schematic map showing all stations.
Undistorted metro network maps, all at the same scale for comparison (http://www.fakeisthenewreal.org/subway/index.html).
Mind the Gap (http://www.cjvlang.com/Spicks/thegap.html) "Mind the Gap" in Japanese, Cantonese and Mandarin.
Memoirs of a subway musician (http://www.sawlady.com/sawmemo.htm) This musician played in the subway stations of NYC, Paris, Prague & Rome.
nycsubway.org (http://www.nycsubway.org) A comprehensive resource on the New York Subway system.
Metro Bits (http://mic-ro.com/metro/) Various aspects of the world's metros.
In many cases, at least a portion of the rails are placed in tunnels dug beneath the surface of a city in which case the system may be called the Underground or the subway.
The volume of passengers a metro train can carry is often quite high, and a metro system is often viewed as the backbone of a large city's public transportation system.
Traditionally, metro trains are driven by human drivers, but automated trains also exist, for example, in London (the Victoria Line), Singapore, and Paris.