https://www.freepressjournal.in/lifestyle/everything-you-need-to-know-about-kolkata-metro-indias-first-under-river-journey-to-begin-on-this-sunday
Notably, Kolkata was also, the first Indian city to get a Metro in October 1984, some 18 years before Delhi got its first Metro line in December 2002
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https://www.freepressjournal.in/lifestyle/everything-you-need-to-know-about-kolkata-metro-indias-first-under-river-journey-to-begin-on-this-sunday
Kolkata to have first under-river metro; here is everything you need to know
www.freepressjournal.inNotably, Kolkata was also, the first Indian city to get a Metro in October 1984, some 18 years before Delhi got its first Metro line in December 2002