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Ø 1971 – MASTER PLAN PREPARED FOR CONSTRUCTION OF A MASS RAPID TRANSIT SYSTEM. Ø 1972 – ON 1ST JUNE, THE MASS RAPID TRANSIT SYSTEM PROJECT WAS SANCTIONED.
Ø 1972 – FOUNDATION STONE OF METRO RAILWAY KOLKATA LAID ON 29THDEC.
Ø 1984 – ON 24TH OCTOBER, METRO RAILWAY, KOLKATA, INDIA’S FIRST METRO WAS COMMISSIONED. COMMERCIAL SERVICES STARTED FROM ESPLANADE TO BHOWANIPUR (NOW NETAJI BHAVAN) FOR A DISTANCE OF 3.4 KMS. Ø 1995 – ON 27TH SEPTEMBER, THE TOTAL LENGTH OF 16.45 KMS FROM DUM DUM TO TOLLYGUNGE STARTED FUNCTIONING BETWEEN 17 STATIONS. Ø 2009 – ON 22NDAUGUST, PART OF THE NEW SECTION OF 5.89 KMS FROM MAHANAYAK UTTAM KUMAR (PREVIOUSLY TOLLYGUNGE) TO KAVINAZRUL COMMISSIONED. Ø 2010 – ON 7TH OCTOBER, THE REMAINING STRETCH OF THE NEW SECTION TO THE SOUTH, 1.58 KMS FROM KAVI NAZRUL TO KAVI SUBHASH WAS COMMISSIONED. Ø 2010 – ON 29TH DECEMBER, METRO RAILWAY WAS CONFERRED THE STATUS OF A ZONAL RAILWAY. Ø 2013 - ON 10THJULY, A NEW SECTION FROM DUM DUM TO NOAPARA( 2.091KM) WAS COMMISSIONED. Ø 2014 – FROM 21ST MAY, DEPARTURE OF FIRST TRAIN (PILOT CUM COMMERCIAL) FROM BOTH ENDS STARTS AT 6:45 HRS IN LIEU OF 7:00 HRS FROM MONDAY TO SATURDAY. Ø 2019 - from 7th july, SUNDAY SERVICES (PILOT CUM COMMERCIAL) STARTS FROM 09:00 HRS IN LIEU OF
09:50 HRS.
Ø 2020 - 13TH February, inaugurated of phase-I of east west corridor (green line) between salt lake sector v to salt lake stadium.
Ø 2020 - 4TH OCTOBER, EAST-WEST METRO CORRIDOR EXTENDED FROM SALT LAKE STADIUM METRO
STATION TO PHOOLBAGAN METRO STATION
commissioned
Ø 2022 - on 11th july, east west metro corridor extended from phoolbagan to sealdah (2.33 km)
Ø 2022 - on 30th december, a new section (purple line) from joka to taratala (6.5 km) was inaugurated.
Ø 2023 - on 2nd january, purple line from joka to taratala (6.5 KM) started its commercial service.
Ø 2024 - on 6th march, purple line was extended from taratala to majherhat (1.25 km); a new section (orange line) from kavi subhash to hemanta mukhopadhyay (5.4 km) was inauguRATED and in green line howrah maidan to esplanade (4.8 km) was inaugurated and all three lines was thrown open for public on 15th march 2024.
Ø 2025 - ON 22ND AUGUST, GREEN LINE FROM ESPLANADE TO SEALDAH (2.45 KM) AND IN ORANGE LINE FROM HEMANTA MUKHOPADHYAY TO BELEGHATA (4.39 KM) WAS EXTENDED AND THROWN OPEN FOR PUBLIC ON 22.08.2025 & 25.08.2025 RESPECTIVELY.
Ø 2025 - ON 22ND AUGUST, A NEW SECTION (YELLOW LINE) FROM NOAPARA TO JAI HIND BIMANBANDAR (6.77 KM) WAS INAUGURATED AND THROWN OPEN FOR PUBLIC ON 25TH AUGUST 2025.
station features Metro construction is of a very complex nature requiring application of several new technologies in the fields of civil, electrical, signaling and telecommunication engineering. Indian engineers, backed by their own experience and supplemented by their studies abroad, adopted advanced technologies in the following fields for the first time in India.  Cut and cover method of construction using diaphragm walls and sheet piles. Use of extensive decking to keep the traffic flowing over the cut while construction in progress underneath. Shield tunneling using compressed air and airlocks. Ballastless track using elastic fastenings, rubber pads, epoxy mortar and nylon inserts. Air-conditioning and ventilation system for environmental control of stations and tunnels. Third Rail current collection system for traction. Underground substations with dry type transformers and SF-6 circuit breakers. Tunnel- Train VHF- radio communication system. Micro-processor-based train control and supervisory remote control system for substations. Automatic ticket vending and checking system.
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