Underground tunnel at Pulbangash metro station complete: DMRC

While this completed tunnel is the downline section of the corridor, DMRC said the up-tunnel is in progress.

Published on: Dec 1, 2025, 03:08:05 IST

By Jasjeev Gandhiok

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The Delhi Metro Rail Corporation (DMRC) has finished constructing an underground tunnel at the Pulbangash metro station on Red Line, as part of the Janakpuri West - RK Ashram Marg extension of the Magenta line, officials said on Sunday.

DMRC is constructing nearly 103km of new metro lines across six corridors (Photo for representation)

The tunnel has been built between the Pulbangash on Red line and the upcoming Sadar Bazaar station on the Magenta line.

DMRC officials said the work on the tunnel included extensive ground strengthening around the existing pier. “The Tunnel Boring Machine (TBM) had to carefully navigate and create the tunnel below the elevated viaducts on which trains of the Red line were operational. The Red line viaduct here stands on open foundations with a balanced cantilever span and so tunnelling beneath such a structure required extraordinary engineering precautions to ensure its safety,” Anuj Dayal, principal executive director, corporate communications at DMRC, said.

“A detailed strategy was adopted to strengthen the area around the pier of the Red line. A grouting programme called TAM (Tube-a-Manchette) was implemented. As per this technology, 180 TAM boreholes were arranged around the pier. After that, high-strength cement grouting was done to stabilise the soil, fill the voids and in the process, increase the load-bearing capacity,” Dayal said.

While this completed tunnel is the downline section of the corridor, DMRC said the up-tunnel is in progress.

As part of its Phase 4 expansion, DMRC is constructing nearly 103km of new metro lines across six corridors. Currently, three corridors—Janakpuri West to RK Ashram Marg (Magenta line extension), Majlis Park to Maujpur (Pink line extension), and Aerocity to Tughlakabad (new Golden line) — are already under construction and nearing completion. Besides, the Pink line is expected to start operations this year and the remaining two corridors are scheduled to be completed by mid-2026.

ABOUT THE AUTHOR
Jasjeev Gandhiok
Jasjeev Gandhiok is an Assistant Editor with Hindustan Times, where he covers environment, climate change, the clean energy transition and wildlife at the National Bureau. Gandhiok has over a decade of experience in journalism and is based in Delhi. He has reported extensively on Delhi and the National Capital Region (NCR). This includes the region's air pollution woes, a polluted Yamuna and on urban wildlife still thriving in the region. He joined HT in October 2021. Prior to that, he had five-year stint at The Times of India in Delhi, where he also covered Delhi, with a focus on environment and wildlife. Gandhiok has covered some recent events around the Capital too, ranging from the farmers' protests, the northeast Delhi riots and the CAA-NRC protests, reporting from the ground on all of these. He also travels across the country to report on how environment and climate change impact everyday life, while also writing on endangered species. His reports in 2019 on toxic leachate from Delhi's landfills led to the National Green Tribunal (NGT) taking suo motu cognisance and ultimately asking the state government to start bio-mining to flatten and remove all three landfills in the capital. He also closely tracks the implementation of government policies on climate, renewable energy and environmental protection. His focus remains on impactful, public-interest journalism which explains how environmental decisions affect people's everyday lives.Read More

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