The National High Speed Rail Corporation Limited is building the 508-km Mumbai-Ahmedabad High Speed Rail corridor through Maharashtra, Gujarat and Dadra and Nagar Haveli. At Thane, the station concourse will be approximately 12 metres above natural ground to preserve mangroves in the eco-sensitive area. Its entrance-building roof is inspired by waves, reflecting the station’s proximity to the Ulhas River.

The Maharashtra section runs 135.45 km from Shilphata in Thane district to Zaroli village near the Gujarat border, with elevated stations at Thane, Virar and Boisar. About 124.027 km will consist of viaducts and bridges. The section includes seven mountain tunnels, with three breakthroughs achieved; bridges include 460 metres over the Ulhas, 2.32 km over the Vaitarna and 510 metres over the Jagani. It will also have 36 bridges and crossings, including 12 steel bridges.

Pier construction spans more than 100 km; about 74 km of piers are complete. Nine casting yards, seven full-span launching gantries and eight SBS launching gantries are operational. The corridor is expected to be completed by December 2029; the 100-km Surat–Vapi phase is scheduled to begin commercial operations in August 2027.

The Maharashtra Airport Development Company (MADC) has started a pre-feasibility study for a proposed third airport in the Mumbai Metropolitan Region (MMR), at Palghar. MADC managing director Swati Pandey said consultants would assess what is feasible; this is the government’s first step.

The airport would complement the proposed Vadhavan deep-water port, described as set to be India’s largest, and infrastructure including the Mumbai Trans Harbour Link and bullet train corridor. CREDAI-MCHI Palghar Boisar Unit president Prashant Khandelwal said improved connectivity could expand commercial, residential and industrial demand, open new micro-markets, and attract Indian and international businesses. The port is expected to improve trade routes for Mumbai, Nashik and Surat.

Boisar’s property rates are lower than Mumbai and Thane, and its schools, hospitals, malls and commercial hubs support a self-sustaining community. A government plan for a North Mumbai sports complex is also expected to generate jobs. Former Maharashtra chief minister Uddhav Thackeray had considered Kelva-Mahim or Dapchari for an MMR airport.

The Vasai-Virar-Palghar region, envisioned as "Mumbai 4.0", has seen sharp land price surges following infrastructure announcements. Non-agricultural land prices in select pockets have doubled or tripled over two years. In Virar (East) along National Highway-48, prices have reached Rs 10 crore an acre; Palghar prices have also risen sharply. Coastal land commands even higher premiums.

Key infrastructure driving demand: Rs 76,000-crore Vadhavan Port (undergoing land acquisition), Mumbai's third offshore airport (similar to Kansai International), Mumbai-Ahmedabad bullet train with Boisar as key station, Delhi-Mumbai Expressway terminating at Virar, proposed Virar-Alibaug corridor, Uttan-Virar Sea Link connecting to Mumbai's Coastal Road northern extension.

Region faces inadequate civic infrastructure: drainage, water supply, electricity and road connectivity shortcomings; commuters depend on overcrowded Western Railway services. Birla Estates and Sunteck Realty have announced projects; large-scale acquisitions by major Mumbai developers are pending. Current demand mainly from investors seeking long-term land acquisition. Experts expect developers from Gujarat, Pune, Bengaluru to play bigger role. Real estate experts caution that infrastructure alone may not guarantee success without local employment opportunities.

Maharashtra’s town-planning and infrastructure authority, CIDCO, has invited real estate developers and companies to bid for long-term leases on 126.6-acre land parcels in Palghar for an industrial township. The project forms part of the proposed “Fourth Mumbai” across the Palghar-Vadhavan-Boisar belt and is expected to be anchored by the upcoming Vadhavan port. The state envisions the corridor as a major urban-industrial cluster comparable in scale to Navi Mumbai, combining employment hubs with housing for workers. Proposed connectivity includes the port, a third airport for the Mumbai region, a bullet train stop and the Delhi-Mumbai Industrial Corridor (DMIC). Palghar’s lower land costs and large contiguous parcels are among the factors attracting interest. CIDCO has outlined a structured bidding process and can accept or reject proposals without giving reasons.

The Forest Advisory Committee of the Union Ministry of Environment, Forest and Climate Change approved diversion of 4.9 hectares for Mumbai Rail Vikas Corporation’s Boisar Goods Siding Yard in January; minutes were uploaded recently. The number of trees to be felled has not been declared. The siding also requires 7.7 hectares of non-forest land.

A fresh state proposal submitted on October 10, 2025, described the forest as degraded, outside a 10-km radius of any national park or wildlife sanctuary, and said no homes would be displaced. Dahanu’s Divisional Forest Officer identified 10 hectares of contiguous, suitable, encroachment-free degraded forest land in Palghar for compensatory afforestation.

The Virar–Dahanu line is being quadrupled to serve rising commuter demand, Vadhavan Port and a planned new city. MUTP-III also includes the Harbour line extension from Goregaon to Borivali, fifth and sixth lines between Borivali and Virar, and other upgrades. More than 60 rakes will need maintenance and over 40 overhauling. In March 2025, the ministry allowed diversion of 43.68 hectares of mangrove forest at Vangaon for a suburban train car shed and Western Railway workshop. Western Railway currently uses carsheds at Mahalaxmi, Kandivali and Virar.