Despite all the hurdles, services began on 24 October 1984, with the commissioning of a partial commercial service covering a distance of with five stations served between Esplanade and Bhowanipur (currently Netaji Bhavan). The first metro was driven by Tapan Kumar Nath and Sanjoy Sil. The service was quickly followed by commuter services on another stretch in the north between Dum Dum and Belgachhia on 12 November 1984. The commuter service was extended to Tollygunge on 29 April 1986, covering a further distance of , making the service available over a distance of and covering 11 stations. However, the services on the north section were suspended starting 26 October 1992, as this small, isolated section was little used. The Line 1 was almost entirely built by cut and cover method, while a small 1.09 km stretch between Belgachia and Shyambazar was built using shield tunneling with compressed air and air locks, since the alignment crossed a railway yard (now Kolkata railway station) and Circular Canal.