North America - metro lines currently under construction. Active tunnelling, new station builds, and line extension projects.
North America - metro and subway lines currently under active construction: new lines being tunnelled through city centres, extensions pushing into new suburban areas, and second phases of recently opened routes. Metro construction is among the most complex and expensive of all infrastructure projects, requiring deep-bore tunnelling, major excavations, and years-long surface disruption. The map shows where this urban rail investment is currently taking place, providing a snapshot of active rapid transit expansion.
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