DELHI METRO

Delhi metro is metro system serving Delhi and its satellite cities in national capital region of India. Delhi metro is the world's 12th longest metro system in length and 10th largest in ridership. The network consists of 5 colour coded regular lines and the faster airport express line with a total length of 218km serving 164 stations. The system has a mix of underground, at-grade and elevated stations using both broad gauge and standard gauge. The power output  is supplied by 25kv 50hz AC through overhead lines. The trains are usually four, six or eight coach length. DMRC operates over 3000 trips daily with first trains starting at 5:00 and last at 23:30. The rolling stock used by DMRC are of two types. Phase I line uses 1676mm broad gauge rolling stock. Phase II line uses 1435mm standard gauge rolling stock.Trains are maintained at seven depots Khyber Pass and Sultanpur for the Yellow Line, Mundka for the Green Line, Najafgarh and Yamuna Bank for the Blue Line, Shastri Park for the Red Line, and Sarita Vihar for the Violet Line.