The Line 1, Blue Line, also known as North–South Metro of the Kolkata Metro, is a rapid transit system serving South 24 Parganas, Kolkata and North 24 Parganas in Indian state of West Bengal. It consists of 26 operational stations from Dakshineswar to Kavi Subhash, of which 9 are elevated, 2 are at grade and the remaining 15 are underground with a total distance of 31.3 km. The line connects Dakshineswar and New Garia and uses 5 ft 6 in (1,676 mm) 5 ft 6 in (1,676 mm) broad gauge rolling stock. Dakshineswar was opened on 22 February 2021 and is elevated and is located 4.1 km (2.5 mi) north of Noapara . It was the first underground railway to be built in India, with the first operations commencing in October 1984 and the full stretch that was initially planned being operational by February