when was the first metro train started in delhi
Delhi Metro The first line of the Delhi Metro, the Red Line, was inaugurated by Atal Bihari Vajpayee, the Prime Minister of India, on 24 December 2002.[20] The Delhi Metro became the second underground rapid transit system in India, after the Kolkata Metro, when the Vishwa Vidyalayaâ€“Kashmere Gate section of the Yellow Line opened on 20 December 2004.[21] The first phase of the project was eventually completed in 2006,[22][23] on budget and almost three years ahead of schedule, an achievement described by Business Week as "nothing short of a miracle".[24]