Green Line (Kolkata Metro)

Green Line, also known as East–West Metro, is a rapid transit metro line of the Kolkata Metro in Kolkata, West Bengal, India. It currently consists of two distinctly operational sections from Salt Lake Sector-V to Sealdah, and Esplanade to Howrah Maidan by going underneath the Hooghly River. A future eastern extension from Sector-V to Teghoria is planned. It will cover a distance of 23.1 km (14.4 mi) and consist of 17 stations from Teghoria (Haldiram) in the east to Howrah Maidan in the west, of which it will consist of 11 elevated and 6 underground stations, and the operational section consists of 6 elevated and 6 underground stations, with a total distance of 15 km (9.3 mi). It is expected to derive a very high ridership, since it will connect India's two largest commuter railway and long-distance railway terminals, Howrah and Sealdah, along with two of its largest business districts, BBD Bagh and Salt Lake Sector V. At present, more than 100,000 passengers commute through the line every day, and this figure is expected to go up to 1 million after it gets fully completed by 2035. It will also connect the industrial hub of Kolkata, i.e., Howrah and the IT hub of Kolkata, i.e., Salt Lake Sector-V. It has interchange with Blue Line at Esplanade and will eventually connect with Purple and Orange Lines.

The Green Line has India's first and biggest underwater metro tunnel, along with the deepest metro ventilation shaft. In the deepest metro shaft, the Howrah metro station is the deepest metro station in India, at a depth of 33 m (108 ft). The first phase between Salt Lake Sector V and Salt Lake Stadium was inaugurated by the then Minister of Railways, Piyush Goyal, on 13 February 2020, and commercial services started from 14 February 2020. The underground stretch till Phoolbagan was opened on 4 October 2020 by the current Minister of Railways, Ashwini Vaishnaw, and then till Sealdah was opened on 12 July 2022. The section between Esplanade and Howrah Maidan was inaugurated by Prime Minister Narendra Modi on 6 March 2024, leaving the gap between Esplanade and Sealdah as the only remaining unopened section. On 21st January 2025 trial run started between Sealdah-Esplanade section.