Purple Line (Kolkata Metro)

Purple Line is a rapid transit metro line of the Kolkata Metro in Kolkata, West Bengal, India. A 6.5 kilometres (4.0 mi) stretch from Joka to Taratala of this line was inaugurated on 30 December 2022 and after extended to Majerhat on 6 March 2024. This line will span 26.88 kilometres (16.70 mi) from IIM-Joka in the south to Eden Gardens in the north. It has interchange with Blue Line at Park Street in central Kolkata and run parallel with Blue Line up to Esplanade where it has an interchange with Green Line. It is being built by Rail Vikas Nigam Limited.
Previously, the stretch from Thakurpukur to Majerhat was surveyed as a branch line of the circular railway, and a metro line from Majerhat to Dakshineswar via Sealdah (interchange with Green Line) was planned. This plan was scrapped and a new metro line from further south in Joka to BBD Bagh was sanctioned in 2010–2011 with a total length of 17.22 km (10.70 mi) at an anticipated cost of ₹2,619.02 crore (equivalent to ₹59 billion or US$690 million in 2023). Later the route was truncated to Esplanade. The corridor runs along Diamond Harbour Road, Khidirpur Road, and Jawaharlal Nehru Road, major arterial roads of Kolkata, and has passenger interchange facilities with the Blue Line and Green line at Esplanade and Blue line at Park street. The proposed Esplanade station will not be the same as that of the Blue Line and Green Line but a different station that will be built at B.C. Roy market ground. The line now has a new depot in Joka. Due to land acquisition problems and objections from the Ministry of Defence, construction has been delayed several times since the beginning. Defence Ministry objected that the elevated corridor would overlook the Eastern Command headquarters at Fort William, Ordinance Depot at Mominpore. The change in alignment from elevated to underground increased the construction cost of the stretch from ₹139 crore (equivalent to ₹164 crore or US$19 million in 2023) to ₹3,000 crore (equivalent to ₹35 billion or US$410 million in 2023). The work resumed in several phases and new bids were invited by Rail Vikas Nigam Limited (RVNL) in April 2020. It is India's first metro line to run on indigenous head hardened rails, manufactured by Jindal Steel & Power. The extension of this line to IIM and Diamond Park for 2 km (1.2 mi) was sanctioned in the 2012–2013 Budget at a cost of ₹294.49 crore (equivalent to ₹555 crore or US$65 million in 2023). The work is being executed by RVNL.
The Mominpur metro station was planned to be built across a 2500 sq. m area. However, the Ministry of Defence objected to the elevated structure, saying that it would overlook the Ordnance depot. This forced RVNL to stall the entire project, and RVNL almost dropped the station from the plan even though it alone would have a projected 20,000 passengers during peak hours. Underground Mominpur station was also not possible due to the sharp gradient from Taratala metro station. After a series of discussions and consultations with the Ministry of Defence and Government of West Bengal in 2016, it was decided to shift the station around 1 km (0.62 mi) northward, near the Alipore Bodyguard Lines. But, after a year Defence Ministry approved the Mominpur metro station in its original location as the change in alignment would have delayed the project and budget overrun. It will be the last elevated station of the corridor. Now, the proposed underground Khidirpur metro station is planned at the Alipore Bodyguard Lines. There were also hurdles regarding clearance for tunneling under defence lands. In 2020, the Defence Ministry eased out the process as lease rent wasn't required anymore for tunneling as long the overground ownership of the land did not change. On 30 December 2022 the Joka - Taratala section and on 6 March 2024, the Taratala - Majerhat section was inaugurated remotely by Honourable Prime Minister Narendra Modi, completing the 7.75 km Phase 1 stretch. On 12 January 2025, it was reported that Metro authorities decided to extend the line to Eden Gardens instead of Esplanade to facilitate commuters and connect Strand Road, BBD Bag and Calcutta High Court. Subsequently, in March 2025 railways sanctioned ₹1,000 crore (equivalent to ₹19 billion or US$220 million in 2023) for the extension.
Around 8.5 kilometres (5.3 mi) of the project will be elevated and the rest of 6.32 kilometres (3.93 mi) of the metro line will be underground. The project is getting delayed due to nonavailability of land for the construction of train depot at Joka. In 2019, RVNL was given the land required for building the depot and the construction for its boundary wall and land development started in February 2019. Tenders for its construction and plant & machinery were invited in April 2020.
Construction was further delayed in September 2018 due to the Majerhat Bridge collapse, the metro was being built right next to the bridge.
Tender for Majherhat to Esplanade underground section has been floated in 1st week of December 2019.
By 15 September 2022, the stretch from Joka to Taratala has been fully constructed and electrification has been done. Testing trials are underway from Joka to Taratala using the old decommissioned Metro Rakes. Eventually in service there will be new air conditioned metro rakes. The stretch from Majerhat to Esplanade is under construction.
Prime Minister Narendra Modi inaugurated the Joka-Taratala stretch, including Joka metro station of Kolkata Metro's Purple Line on 30 December 2022 in the presence of West Bengal Chief Minister Mamata Banerjee and Indian Railway Minister Ashwini Vaishnaw. Some students from schools especially St Thomas Boys School, whose premises are utilised for planned Khidirpur metro station in this stretch, were granted the rare opportunity to be the first ones to ride in this Joka-Taratala stretch after the inauguration.
After lot of hardships and developmental work the Taratala–Majerhat section of Kolkata Metro Purple Line was inaugurated on 6 March 2024 by Prime Minister Narendra Modi, along with the truncated sections of Esplanade–Howrah Maidan under Green Line and Kavi Subhash–Hemanta Mukhopadhyay under Orange Line.
The work has been sanctioned in 2010-11 for the new Metro line from Joka to B.B.D. Bagh for a length of 16.72 km (10.39 mi) at an anticipated cost of Rs. 2619.02 Crores. But, later the route was shortened and planned to terminate at Esplanade. A separate Depot was built by RVNL in Joka. The tender has gone to Simplex Infrastructures. The extension of this line to IIM and Diamond Park for 2 km (1.2 mi) has been sanctioned in the Budget of 2012–13 at a cost of Rs. 294.49 Cr. Another extension from Esplanade to Eden Gardens has been sanctioned on March 2025 by Ministry of Railways at a cost of Rs. 1000 Cr. The execution of this work has been entrusted to RVNL.
There are 3 phases in this line-