Factfile on Delhi Metro:

* Delhi Metro Rail Corporation (DMRC) was set up in 1995, construction started in 1998 and the first section opened in 2002.

* The total length of the Metro is 138 km, there are 16 sections and 117 stations.

* The longest lines are Dwarka Sector 9-Noida city centre and Jahangirpuri-Qutub Minar, both 45-km long.

* At 6.25 km, Yamuna Bank-Anand Vihar is the shortest line.

* The daily ridership is over a million.

* The strength of the Delhi Metro is about 6,000.