Wed Feb 04 08:21:17 UTC 2026: # Chennai Metro Rail Phase II Faces Delays, Nears Breakthrough

The Story:
Chennai Metro Rail’s Phase II project, specifically the tunnel connecting Mylapore with Marina Beach, is nearing a significant milestone. The Tunnel Boring Machine (TBM), after a delay of a year and a half, is set to break through at Thirumayilai on February 9, 2026, following approval from the Commissioner of Railway Safety (CRS). Trains are expected to run through this tunnel in about two years. The delay has been attributed to multiple factors, including slow tunnel shaft construction, challenging soil conditions, and safety concerns.

Key Points:

  • The TBM launched from Light House in September 2023 and was originally scheduled to complete tunnelling in one year.
  • The delay was caused by slow construction of the tunnel shaft at Thirumayilai by the contractor, numerous changes to the TBM’s cutter head discs, difficult soil conditions, temporary work stoppages due to cracks in a school, and a gas leak.
  • CRS approval was required due to the TBM drilling within 10 meters of the Thirumayilai MRTS station pile.
  • Delays in obtaining CRS approval from the Railways also contributed to the project setback.
  • CMRL officials cited concerns about incurring steep waiting period charges if the TBM arrived at the station before it was ready.

Key Takeaways:

  • Large infrastructure projects in Chennai face significant challenges due to logistical complexities, contractor performance, and safety regulations.
  • Unexpected geological conditions and environmental concerns can significantly impact project timelines and budgets.
  • Coordination between various stakeholders, including contractors, railway authorities, and safety regulators, is crucial for the timely completion of infrastructure projects.
  • The report highlights the balance between pushing contractors for speed and managing potential cost overruns associated with delays.
  • Despite delays, the project is progressing, promising improved connectivity in Chennai in the coming years.

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