"metro" - key terms from Wikipedia

athens metro
austin metro
budapest metro
delhi metro
dubai metro
geo metro
guangzhou metro
kiev metro
louisville metro
madrid metro
manila metro rail transit system
metro
metro airport
metro area
metro atlanta
metro blue line
metro center
metro davao
metro detroit
metro ethernet
metro gold line
metro hit radio
metro iii
metro light rail
metro line
metro manila
metro network
metro north
metro rail
metro rapid
metro red line
metro station
metro stations
metro system
metro systems
metro transit
metro vancouver
mexico city metro
mg metro
montreal metro
moscow metro
mumbai metro
muni metro
prague metro
shanghai metro
stockholm metro
tokyo metro
tokyo metro marunouchi line
valley metro
washington metro