 The Blue Line was the third line of the Metro to be opened, and the first to connect areas outside Delhi. Mainly elevated and partly underground, it connects Dwarka Sub City in the west with the satellite city of Noida in the east, covering a distance of 47.4 kilometres (29.5 mi). The first section of this line between Dwarka and Barakhamba Road was inaugurated on 1 January 2006, and subsequent sections opened between Dwarka – Dwarka Sector 9 on 1 April 2006, Barakhamba Road – Indraprastha on 11 November 2006, Indraprastha – Yamuna Bank on 10 May 2009, Yamuna Bank – Noida City Centre on 12 November 2009, and Dwarka Sector 9 – Dwarka Sector 21 on 30 October 2010. This line crosses the Yamuna River between Indraprastha and Yamuna Bank stations, and has India's second extradosed bridge across the Northern Railways mainlines near Pragati Maidan. A branch of the Blue line, inaugurated on 8 January 2010, takes off from Yamuna Bank station and runs for 6.25 kilometres (3.88 mi) up to Anand Vihar in east Delhi. It was further extended up to Vaishali which was opened to public on 14 July 2011. A small stretch of 2.76 kilometres (1.71 mi) from Dwarka Sector 9 to Dwarka Sector 21 was inaugurated on 30 October 2010. Interchanges are available with the Yellow Line at Rajiv Chowk station, Green line at Kirti Nagar, Violet line at Mandi House, Airport Express (Orange) line at Dwarka Sector 21 and with the Indian Railways network and Interstate Bus Station (ISBT) at Anand Vihar station, which connects with Anand Vihar Railway Terminal and Anand Vihar ISBT.
