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List of United States rapid transit systems - Wikipedia
List of rail transit systems in the United States - Wikipedia
List of North American rapid transit systems - Wikipedia
What Us Cities Have Subways: Urban Transit Explored
New York Subway System: Maps, Schedules and NYC Travel …
New York City Subway - Subway map, routes, schedules and fares
MTA Live Subway Map
How to ride the NYC subway - MTA
Subway Systems in the United States - AFT Media
Subway | History, Transportation, Cities, & Facts | Britannica