The Yellow Line is one of the lines of the Delhi Metro, a rapid transit system in Delhi, India. It consists of 37 metro stations from Samaypur Badli in Delhi to HUDA City Centre in the neighbouring city of Gurgaon. The line with a length of is mostly underground and has been laid under one of the most congested parts of Delhi. The underground stretch from Vishwa Vidyalaya — Kashmere Gate, the first section of the line was inaugurated on 20 December 2004. It is the 2nd longest metro line on the Delhi Metro network. This line covers Outer Delhi, North Delhi, through Central Delhi and South Delhi and finally Gurgaon.