Kolkata Metro Expansion & Riverfront Modernisation: Rebuilding a City That Built Bharat

Kolkata is often remembered through the lens of heritage, trams, literature and colonial architecture. But beneath that familiar image, the city is undergoing one of the most ambitious infrastructure transformations in its modern history. From six metro corridors and India’s first underwater metro section to a major Hooghly riverfront revival and smart city upgrades, Kolkata is preparing for a very different urban future by 2030.

India's first operational Metro — Kolkata opened its subway in 1984, twelve years before Delhi — is now in the middle of its most ambitious expansion since inception. Six new metro corridors are in varying stages of construction, planning, and operation, adding 95 kilometres to the existing 45-km network. The transformation is incomplete, contested, and delayed in places. But it is happening.

Also Read: Suvendu Adhikari Cabinet List: Who Gets What in West Bengal’s New Government?

The Metro Map Redrawn: All Six Lines Explained

Line 1 (Blue Line: Dum Dum to Kavi Subhas) — the original 45-km corridor — is fully operational and carries 6.5 lakh daily passengers, its highest ever. The extension to New Garia Airport is under civil works with a 2026 target. Line 2 (Green Line: East-West Metro, Sector V to Howrah Maidan) is the engineering crown jewel — the Hooghly River tunnel segment between Esplanade and Howrah, built at a depth of 33 metres below the riverbed, is one of the most technically complex underwater metro projects in Asia. The Esplanade-Howrah section opened for revenue service in March 2024, making this the world's first metro line to cross the Hooghly underwater.

Line 3 (Orange Line: Joka to Esplanade) is progressing in three phases; the Joka-Taratala section is operational, Taratala-Majerhat under trial runs, and Majerhat-Esplanade in advanced civil works. Line 4 (Noapara to Airport, currently tendered) and Line 6 (New Town to Airport connector) address the critical airport-city gap that has made Kolkata the only metro among India's six busiest cities without direct rail-to-airport connectivity. When Line 6 is operational by 2027, the journey from New Town to the airport drops from 45 minutes by road to under 12 minutes.

The Numbers Behind the Network

The total sanctioned cost of all metro projects in Kolkata currently stands at Rs 52,600 crore — the second-largest metro investment in a single Indian city after Delhi. KMRC (Kolkata Metro Rail Corporation) data for FY2024-25 shows daily ridership across all operational lines at 8.2 lakh trips — a 34% increase over the pre-COVID 2019 peak of 6.1 lakh. The East-West Metro alone added 1.4 lakh new riders in its first six months of full operation, significantly higher than projected.

Union Budget 2025-26 allocated Rs 2,600 crore specifically for Kolkata metro expansion — including Rs 980 crore for the Airport connectivity lines and Rs 740 crore for completing the Joka-Esplanade segment. Separately, JICA is financing 51% of the East-West Metro's remaining civil works under a concessional loan agreement signed in 2018.

Also Read: West Bengal Violence: Police Team Attacked in Sandeshkhali; 5 Injured

The Hooghly Riverfront: Kolkata's Biggest Outdoor Project

• Kolkata is expanding metro infrastructure alongside riverfront development.
• The city is reshaping its relationship with Hooghly river through rivitalisation plan.
• The project name is called as the Hoogly Riverfront revitalisation plan.
• This plan was made by KMDA (Kolkata Mteropolitan Development Authority) in 2021.
• This area covers the range of 22 kilometres from Baranagar to Garden Reach.
• Phase 1 ranges from Princep Ghat to Millennoium Park that is 4.2 km.
• Phase 1 was developed between 2020 and 2023 and now it has become Kolkata's most visited walkway.
• According to KMC data, this place attracts 25000 daily visitors on weekends.
• Phase 2 covers the distance from Howrah Bridge to Outram Ghat in both directions.
• Phase 2 received Rs.1200 crore allocation in the state budget 2024-25.
• Planned developments include heritage-integrated walkways, floating ferry terminals, amphitheatres and artisan market spaces.
• The Inland Waterways Authority of India (IWAI) has partnered with KMDA for upgrades.
• 11 ferry ghats will be upgraded with floating pontoons, digital ticketing and CCTV security infrastructure.
• The aim is to reduce overcrowding on Hoogly bridges carrying 4.5 lakhs vehicles daily at 110% capacity.

Smart City Mission: What Kolkata Actually Received

Kolkata was selected under the Smart Cities Mission in the second round (2016) with a total project cost of Rs 2,516 crore. Of this, Rs 1,890 crore has been utilised as of March 2025 across 67 projects. The most impactful interventions have been the Integrated Traffic Management System (ITMS) — now covering 300 signalised intersections with AI-based adaptive signal timing — and the Kolkata Smart Water Grid, which has reduced non-revenue water losses in the project area from 34% to 19% in three years.

The New Town Smart City project (a separate satellite township initiative under HIDCO) has been the more technically ambitious of the two streams, deploying fibre-to-home networks across 40,000 households, 150 EV charging stations, and a 30 MW solar park on its rooftop aggregation programme — making New Town one of the highest solar-per-capita townships in Eastern India.

The Unfinished Agenda: What the City Still Gets Wrong

Honesty demands this section. Kolkata's drainage infrastructure, despite Rs 2,400 crore of investment under the Atal Mission for Rejuvenation and Urban Transformation (AMRUT) and Smart Cities, still floods multiple neighbourhoods in every major monsoon.

The 2024 flood events — triggered in part by a combination of cyclone Remal's rainfall and systemic pump failures — submerged areas of South Kolkata that had been deemed flood-safe after infrastructure upgrades. The root cause is not engineering failure alone — it is encroachment on water-retention ponds (jheels) that have been filled for housing development, destroying the city's natural sponge capacity.

2030: What the City Could Look Like

By 2030, if all six metro lines are fully operational, Kolkata will have a 140-km metro network — larger than Bengaluru's and comparable with Chennai. Over 22 lakh daily metro trips will divert close to 8 lakh private vehicle journeys, improving average road speeds in the central business district by an estimated 22% (KMRC transport modelling, 2024).

The riverfront, from Baranagar to Garden Reach, will be a continuous public space of a scale and ambition that no other Indian city has delivered along a major river. The city that invented India's public transport story is writing its next chapter — and this time, it goes underground.

FAQs

How many metro lines are being developed in Kolkata?

Kolkata is witnessing expansion across six metro corridors, including operational, under-construction and planned routes.

What is special about the East-West Metro in Kolkata?
The East-West Metro includes an underwater tunnel section beneath the Hooghly River, connecting key parts of Kolkata and Howrah.

What is the Hooghly Riverfront revival project?
It is a major riverfront redevelopment plan aimed at creating public walkways, ferry terminals, cultural spaces and improved river transport infrastructure along the Hooghly.

What could Kolkata’s metro network look like by 2030?
If planned projects are completed, Kolkata’s metro network could expand to around 140 km by 2030.

What are the major challenges in Kolkata’s urban development?
Key challenges include drainage issues, monsoon flooding, encroachment on wetlands and delays in infrastructure implementation.

For more breaking news, trending stories and important updates from all over Bharat, stay connected with News4Bharat.