Delhi Metro Rail Corporation (DMRC) has achieved a crucial tunnel breakthrough on the Golden Line corridor of Phase 4. This milestone, completed near Tughlakabad Railway Colony station, signals accelerating progress on a route that will significantly improve connectivity across South Delhi.
The breakthrough was accomplished by a Tunnel Boring Machine (TBM) deployed by the project contractor, which completed a 960-metre twin-tunnel section between Tughlakabad and Tughlakabad Railway Colony. This stretch forms part of the larger underground alignment between Sangam Vihar and Sarita Vihar Depot and includes three major underground stations: Maa Anandmayee Marg, Tughlakabad Railway Colony, and Tughlakabad. This isn’t the first breakthrough on the route. In June 2025, a similar feat was recorded on a different section, demonstrating the momentum Phase 4 has gained despite the challenges of tunnelling in densely built-up areas.
Another significant tunnelling achievement occurred when a 91-metre-long TBM broke through at Vasant Kunj station after completing a 1,550-metre excavation between Kishangarh and Vasant Kunj. This segment, also under the Golden Line corridor, underscores the scale and engineering intensity required to build safe, sustainable urban transport underground. The Golden Line, once operational, will span 23.622 km from Aerocity to Tughlakabad, integrating nearly 15 stations and serving as a critical link between Delhi’s airport hub and southern suburbs. This strategic corridor is expected to alleviate pressure on existing lines, provide faster east-west and north-south transit options, and foster more sustainable mobility solutions.
Officials involved in the project emphasised that these engineering breakthroughs are not only structural milestones but also enablers of a greener, low-emission transport ecosystem. The use of electric TBMs and the planning of intermodal connections at new stations align with Delhi Metro’s broader climate-conscious development strategy. Experts in urban transport infrastructure note that as Delhi grapples with congestion and air pollution, underground metro expansions like the Golden Line represent a shift toward equitable, climate-resilient city building. The metro’s continued growth also brings employment, investment in advanced tunnelling technologies, and ultimately, faster daily commutes for thousands of residents.
With the Golden Line slated for completion in 2026, attention now turns to the remaining construction and integration works. Once operational, the line is expected to significantly reshape commuting patterns in the southern stretch of the National Capital, strengthening linkages between residential clusters, workplaces, and intercity transport nodes. The Phase 4 expansion reflects a broader commitment to sustainable urbanisation, reinforcing Delhi Metro’s role not just as a mass transit provider but as an anchor in the capital’s eco-urban future.
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