Terms: Urban Trains (940), trams (2680000), tramway (1510000), commuter trains (622000), commuter transport (10300), passenger trains (883000), tramways (508000), urban transport (916000),
Terms: metro train (137000), metro trains (71200), metros (19100000), metro cars (22900), modular metros (1),
Terms: carbody (60600), citadis (1890), alstom vehicle (3), subway system (1200000), transit cars (84800), transit buses (539000), rolling stock (2260000), rail car builders (126), railcar builders (165),
Terms: transit light rail (131000), transit commuter (46200),
Terms: light rail (3750000), light rail industry (205), light rail transit association (2910),
APTA: U.S. Light Rail Transit System Links
http://apta.com/links/transit_by_mode/lightrail.cfm