Purple Line (Kolkata Metro)

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.^[7] 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$620 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^[7] and objections from the Ministry of Defence, construction has been delayed several times since the beginning.^[8] 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$17 million in 2023) to ₹3,000 crore (equivalent to ₹35 billion or US$370 million in 2023).^[9] The work resumed in several phases and new bids were invited by Rail Vikas Nigam Limited (RVNL) in April 2020.^[10][11][12] It is India's first metro line to run on indigenous head hardened rails, manufactured by Jindal Steel & Power.^[13] 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$59 million in 2023). The work is being executed by RVNL.^[14]

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.^[15] 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.^[16] 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.^[15][17] Now, the proposed underground Khidirpur metro station is planned at the Alipore Bodyguard Lines.^[18] There were also hurdles regarding clearance for tunneling under defence lands.^[16] 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.^[9] On 30 December 2022 the Joka - Taratala section and on 6 March 2024, the Taratala - Majerhat section was inaugurated remotely by Prime Minister Narendra Modi, completing the 7.75 km Phase 1 stretch.

Commercial Operations between Joka and Majerhat began on 6 March 2024

The service starts from Joka starts at 6:40 am and at Majherhat from 7:03 am and ends at Joka at 9:05 pm and at Majherhat at 9:26 pm , with 84 pairs of services from Monday to Friday. The trains run at a frequency of first 2 service from Joka and 1 service from Majerhat are 23 minutes and rest services are 21 minutes.

In a separate development, Kolkata metro has announced that the Purple Line, running between Joka and Majerhat, will be available on Saturdays as well. The services are expected to cater to the large population employed in the IT sector.

The services have begun on November 22, 2025. According to a press release by the Kolkata Metro Rail Corporation, a total of 40 services, 20 UP and 20 Down, will operate every Saturday at an interval of 21 minutes.

On Saturdays, the first train will depart from Joka to Majerhat at 1:25 PM, while the first train from Majerhat will leave at 1:49 PM for Joka. The last service from Joka to Majerhat will run at 8:11 pm. The final train from Majerhat to Joka will depart at 8.32 pm. The frequency of first 2 trains from Joka are 28 minutes and first 1 train from Majerhat is 24 minutes, rest services are of 21 minutes. There are no services on Sundays.

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.^[19] Subsequently, in March 2025 railways sanctioned ₹1,000 crore (equivalent to ₹19 billion or US$200 million in 2023) for the extension.^[20]

On 25 March 2025, The Times of India reported that Metro railway sent a proposal to Ministry of Railways to extend the Diamond Park Branch to Tollygunge, which will be 8.5 km (5.3 mi) long.^[21] In this route three underground station at Thakurpukur Cancer Hospital, Ramchandrapur and Panchanantala will come.^[22]

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.^[4] 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.^[23] Tenders for its construction and plant & machinery were invited in April 2020.^[24]

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.^[25][26][27]

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.^[28][29]

On 10 July 2025, a significant milestone was achieved in this project as the assembled TBM– S1410 (Durga) started digging up the tunnel near Khidirpur metro station, inside the premises of St Thomas School. This digging work will continue till Park Street metro station via Victoria metro station, after which the remaining section will be done using cut-and-cover method.^[30]

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 3.39 km (2.11 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 in March 2025 by Ministry of Railways at a cost of Rs. 1000 Cr. The execution of this work has been entrusted to RVNL.

There 2 phases of work and 4 extensions are planned in this line –

• Phase 1:
  • Joka to Majherhat (Operational)
• Phase 2:
  • Majherhat to Eden Gardens (Under Construction)
• Extensions:
  • IIM-Joka to Joka (Approved)
  • IIM-Joka to Diamond Park (Approved)
  • Diamond Park to Mahanayak Uttam Kumar (Proposed)

More information No., Station Name ...

Purple Line (Main Line)
No.	Station Name		Distance (km)	Opening	Connections	Layout	Platform Type
	English	Bengali
1	IIM-Joka	আইআইএম জোকা	0	Approved		Elevated	TBD
2	Joka	জোকা	1.572	30 December 2022			Side
3	Thakurpukur	ঠাকুরপুকুর	1.45
4	Sakher Bazar	সখেরবাজার	1.22
5	Behala Chowrasta	বেহালা চৌরাস্তা	1.45
6	Behala Bazar	বেহালা বাজার	1.34
7	Taratala	তারাতলা	1.03
8	Majerhat	মাঝেরহাট	1.25	6 March 2024	Majerhat
9	Mominpur	মোমিনপুর	1.015	November 2026			TBD
10	Khidirpur	খিদিরপুর	1.115	May 2028		Underground
11	Victoria	ভিক্টোরিয়া	2.155
12	Park Street	পার্ক স্ট্রিট	1.265		Blue Line
13	Esplanade	এসপ্ল্যানেড	0.925		Blue Line   Green Line
14	Eden Gardens	ইডেন গার্ডেনস	–	May 2028	Eden Gardens

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  ICF Medha rake MR 418 on the day of inauguration of Purple Line at Joka metro station
• The day of inauguration of phase 1

• List of Kolkata metro stations
• Kolkata Metro Rolling Stock
• 2018 Kolkata bridge collapse
• Kolkata Suburban Railway