United Kingdom Metro Lines Under Construction — Active Tunnelling, New Stations and Line Extensions

United Kingdom metro lines currently under construction. Active tunnelling, new subway station builds and rapid transit line extension projects.

United Kingdom 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 rail infrastructure projects, requiring deep-bore tunnelling, major excavations and years-long surface disruption. The map shows where urban rapid transit investment is currently taking place.

United Kingdom currently has 791 railway segments under construction including 781 railway, 8 tram and 2 narrow gauge.