The Blue Line is a rapid transit metro line of the Delhi Metro in Delhi, India. Predominantly elevated, it is the longest line on the network and consists of a Main Line with 50 stations from Noida Electronic City to Dwarka Sector 21, spanning a length of 56.11 kilometres, and a Branch Line consisting of eight stations from Vaishali to Yamuna Bank, with a length of 8.51 kilometres. From Wikipedia
