Archive · 1 Dec 2025
Delhi Metro Completes Underground Tunnel Under Red Line
The Delhi Metro has finished building an underground tunnel right below an existing elevated train line in North Delhi.
This is a big deal because the elevated line is very sensitive to any ground movement.
To make sure everything stayed safe, engineers strengthened the ground and used special machines to monitor everything in real time.
They did all this without stopping the trains above, which carry a lot of passengers every day.
This project is part of a bigger plan to expand the Delhi Metro.
Delhi Metro completed tunneling under the Red Line viaduct at Pulbangash without disrupting services.
The project involved using a Tunnel Boring Machine (TBM) to build the down-line section of the Magenta Line extension.
Engineers used TAM grouting and advanced real-time monitoring to ensure safety and stability.
The Red Line's elevated viaduct posed unique challenges due to its open foundations and sensitivity to ground movement.
This achievement is significant for the ongoing Phase IV expansion of the Delhi Metro.
- Who
- Delhi Metro Rail Corporation (DMRC)
- What
- Completed tunneling under the Red Line viaduct
- When
- Down-line tunnel completed; up-line in progress
- Where
- Pulbangash, North Delhi
- Why
- To extend the Magenta Line without disrupting Red Line services
- Project
- Janakpuri West-RK Ashram Marg extension of the Magenta Line
- Location
- Pulbangash, North Delhi
- Technique
- Tunnel Boring Machine (TBM)
- Passenger Impact
- No disruption to Red Line services
- Engineering Challenge
- Tunneling under an elevated viaduct with open foundations
- Safety Measures
- TAM grouting, real-time monitoring with advanced instrumentation
- Significance
- Important milestone in Delhi Metro's Phase IV expansion
