The Delhi Metro, the lifeline of Delhi-NCR, has completed 17 years of operations and continues to remain the most popular form of mass transport in the city.Measuring nearly 350 kilometres and having 253 stations, the Delhi Metro network has over the years spanned length and breadth, covering every nook and corner of the city and the nearby NCR, with a ridership of over 26 lakh people annually.On December 24, 2002, the Delhi Metro began operations along an 8.5-kilometre stretch between Shahdara and Tis Hazari stations on the Red Line. As the years progressed, more lines have been constructed under three phases and today, Delhi has one of the most extensive metro networks in India.It has been built with assistance from Japan, which helped Delhi Metro with funding of its projects.Currently, there are nine-colour coded metro lines -- Red Line (Dilshad Garden to Shaheed Sthal New Bus Adda), Blue Line (Dwarka Sector 21 to Noida Electronic City/Vaishali), Yellow Line (Samaypur Badli to HUDA
