Thane's Twin Infrastructure Leap

For years, the story of Ghodbunder Road has been one of promise weighed down by patience. It is the artery that Thane breathes through, carrying thousands of commuters, container trucks and daily wage-earners between the city and the western suburbs, yet its narrow ghat stretches have long tested the endurance of anyone who dared travel during peak hours. That story is now being rewritten from two directions at once. The Mumbai Metropolitan Region Development Authority has commenced crucial construction work for the Thane-Borivali underground tunnel project, with the current phase underway in the Mullabag area of Ghodbunder, prompting the Thane Traffic Police to announce major diversions in the Mullabag zone for a full year from May 16, 2026, to May 15, 2027. Just a few kilometres away, trains have already begun testing the rails of Metro Line 4, the corridor that will eventually stitch Thane into Mumbai's metro map.

The tunnel itself is an engineering undertaking of considerable scale. The MMRDA has undertaken construction of a proposed twin tube tunnel between Thane and Borivali under Sanjay Gandhi National Park, creating a direct connection between the Western Express Highway on the Borivali side and Thane's Ghodbunder Road, with a total project length of 11.85 km of which 10.25 km is tunnel and 1.60 km is approach road, each tube 13.3 metres in diameter with two lanes plus an emergency lane. This subterranean passage, designed to cut travel time between Thane and Borivali down to just a few minutes, will run directly beneath SGNP, resolving the chronic bottleneck of the narrow Ghodbunder Ghat section. Once complete, the tunnel is projected to reduce travel time between Borivali and Thane from the current 60–90 minutes to just about 15 minutes.

On the ground, the project has moved well past the paperwork stage. Procurement of tunnel boring machines from Herrenknecht, Chennai has been completed, with TBM-1 named Nayak arriving at the Thane side on 17th June 2025 and launched by the Chief Minister on 7th April 2026, with excavation now underway. A second machine, TBM-2 named Arjuna, has also arrived at the Thane site and its assembly is in progress. On the Borivali flank, casting yard setup is underway along with rehabilitation of project-affected persons, while piling activity has commenced at the launching shaft area, with excavation to follow once the shifting is complete. As of the most recent official update, the project's physical progress stood at 11.49 percent till March 2026, with financial progress at 10.36 percent till February 2026.

While the tunnel opens up the east-west link to the western suburbs, Metro Line 4 addresses the north-south spine that Thane has never had. The 35.2-km Metro Lines 4 and 4A, built at an investment of ₹16,000 crore, will connect Wadala, Ghatkopar and Mulund in Mumbai with Kasarvadavali and Gaimukh in Thane. Chief Minister Devendra Fadnavis and Deputy Chief Minister Eknath Shinde, along with Transport Minister Pratap Sarnaik, have already flagged off the trial run of Phase-1 of Metro Lines 4 and 4A. Key stations along the Ghodbunder Road belt, including Kasarvadavali, Vijay Garden, Dongripada and Kapurbawdi, are set to give residents direct rail access into the city for the first time, easing the load that currently falls entirely on the road.

What makes this moment significant for homebuyers is not either project alone but the way the two complement each other. The tunnel solves the problem of getting out of Thane westward, past the geographic wall of SGNP, into Borivali and the Western Express Highway corridor. The metro solves the problem of moving along the Thane spine itself and onward into central Mumbai via Wadala, Ghatkopar and Mulund. Together, they convert Ghodbunder Road from a single congested lifeline into a junction served by rail, tunnel and road, a shift that infrastructure planners have long argued Thane needed before it could truly function as an extension of the city rather than a distant suburb.

Real estate observers are already pricing in this shift. Investment analysts tracking the corridor note that micro-markets at either tunnel portal are projected to see 20–25% capital appreciation by the 2028 completion date. On the ground, this is visible in how projects are being positioned: real estate trends in Thane West already show developers marketing projects with the tagline of reaching Borivali in 15 minutes. It is worth remembering, however, that the remaining stations of the metro's 10.5 km priority section are targeted for commissioning by around April 2026, subject to approvals and readiness, so full-scale benefits will roll out in phases rather than overnight.

For anyone evaluating a home along this stretch, the practical takeaway is patience paired with positioning. Traffic diversions around Mullabag will persist through much of the coming year as tunnelling advances, and the metro's remaining stretches will open in stages. But the direction of travel, quite literally, is set. Localities that sit close to both the upcoming tunnel portal and a metro station stand to gain the most once both systems are operational, since they will offer residents a rare combination: a swift underground route west to Borivali and the airport-side suburbs, and a metro ride north-south into the heart of Mumbai, without depending solely on a single congested road.