North America - planned and proposed metro lines. Future underground routes and rapid transit expansion projects before construction begins.
North America - metro and subway lines formally proposed or in active planning: future underground corridors announced, studied, or included in urban transport master plans but not yet under construction. Shows where cities plan to extend rapid transit coverage — new orbital lines connecting suburbs without routing through the city centre, extensions to areas that have grown beyond the existing network, and entirely new systems in cities currently without metro.
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