Delhi Metro Rail Corporation (DMRC) has marked a significant milestone by completing tunnelling work between Maa Anandmayee Marg and Tughlakabad Railway Colony on the Golden Line, a crucial part of the Aerocity–Tughlakabad corridor under Phase IV expansion. This achievement not only demonstrates engineering prowess but also reinforces the city’s commitment to building sustainable, equitable, and eco-friendly public transit.
On 7 June, the Tunnel Boring Machine (TBM) successfully broke through at the Tughlakabad Railway Colony station, concluding a complex 792-metre stretch of underground tunnel. The machine itself was 96 metres long, and its breakthrough was witnessed by key government officials and DMRC executives, highlighting the importance of this project to Delhi’s transport future. Constructed at an average depth of 18 metres below the surface, the tunnel comprises 566 circular precast concrete rings. These rings were manufactured in a fully mechanised yard located in Mundka and were steam-cured to ensure early strength and durability. The tunnel measures 5.8 metres in inner diameter and was built using the Earth Pressure Balancing Method—a technique known for minimising disruption to surrounding built-up areas.
The parallel tunnel designated for the downward metro track is projected to reach breakthrough by July 2025. As part of Phase IV approvals, Delhi Metro is currently constructing a total of 40.109 kilometres of underground routes, with 19.343 kilometres specifically allocated to the Aerocity–Tughlakabad corridor. This corridor is set to significantly improve connectivity across South Delhi and adjacent regions, fostering equitable access to reliable public transport. Safety has been a paramount concern during this tunnelling work. DMRC officials confirmed that comprehensive safety protocols were strictly observed throughout construction. Ground movements were carefully monitored using precision instruments, ensuring the stability of existing urban structures. This cautious approach reflects the corporation’s dedication to safeguarding communities while expanding infrastructure.
The use of TBMs has been central to Delhi Metro’s expansion efforts, especially in dense urban environments where traditional tunnelling methods pose greater risks and disruptions. During Phase III, DMRC successfully deployed nearly 30 TBMs, and this momentum continues as the city’s transit network evolves to meet growing demand and climate commitments. Experts in urban infrastructure note that such projects are essential not only for easing urban congestion but also for contributing to the city’s zero net carbon goals. Underground metro networks encourage public transit over private vehicle use, thus lowering emissions and reducing Delhi’s notorious air pollution levels. The expansion also aligns with principles of sustainable urban development by promoting gender-neutral and accessible mobility options for all residents.
The Golden Line segment’s progress symbolizes more than just physical construction. It embodies Delhi’s ongoing transformation into a resilient, future-ready metropolis where sustainable public transport infrastructure underpins social and economic inclusion. The metro expansion is expected to create significant environmental benefits by reducing dependency on fossil fuel-powered vehicles and improving urban air quality. Moreover, the development reinforces the city’s capacity to adopt cutting-edge technology and engineering methods, exemplified by the Earth Pressure Balancing TBM approach. This method maintains soil balance during excavation, preventing surface subsidence and protecting critical infrastructure, thereby ensuring the cityscape remains stable as underground works progress.
As Delhi’s population continues to surge, the need for reliable, efficient, and green mass transit solutions grows more urgent. The Phase IV corridor from Aerocity to Tughlakabad is strategically important, connecting key residential and commercial zones while supporting equitable urban mobility. Once operational, it will provide commuters with faster travel times, better safety standards, and enhanced comfort. City officials and transport planners highlight that the successful tunnel breakthrough sets a positive precedent for remaining segments of the project. With the parallel tunnel expected to complete breakthrough next year, the overall timeline for Phase IV remains on track. This steady progress also reflects effective project management and robust coordination among multiple stakeholders.
The Delhi Metro expansion exemplifies a forward-thinking infrastructure initiative that balances modern engineering, sustainability, and urban livability. In the broader context of India’s urban development goals, such projects serve as a model for other metropolitan areas aiming to modernise transport systems while prioritising environmental stewardship and inclusivity. In conclusion, the recent tunnel breakthrough on the Golden Line is a tangible step toward realising Delhi’s vision of an eco-friendly, sustainable, and equitable city. The expanding metro network is more than a transit solution; it is a strategic asset driving positive social and environmental change in India’s capital.
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