United States Proposed Metro Lines — Planned Subway Routes and Future Underground Expansions

United States planned and proposed metro lines. Future underground routes and rapid transit expansion projects before construction begins.

United States 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 beyond the existing network and entirely new metro systems in cities currently without subway.

United States has 967 proposed railway segments including 883 railway, 3 tram, 26 metro and 55 light rail.

  • United States — Metro Map
  • United States — Metro Under Construction
  • United States — Proposed Metro Lines
  • United States — Metro Stations Map
  • United States — Metro Speed Map
Proposed
Other lines
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Last update: 2026-05-21

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🇺🇸United States
Motorways
🚇Metro
Proposed
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🇺🇸United States – Metro Proposed Map

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