"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