Delhi Metro is a rapid transit system serving Delhi, Gurgaon, Noida, and Ghaziabad in the National Capital Region of India. Delhi Metro is the world’s 13th largest metro system by annual passenger rides as of 2012-13. Delhi Metro is India’s first modern public transportation system,which has revolutionized travel by providing a fast, reliable, safe, and comfortable means of transport. The network consists of six lines with a total length of 189.63 kilometres (117.83 mi) with 142 stations, of which 35 are underground, five are at-grade, and the remainder are elevated. All stations have escalators, elevators, and tactile tiles to guide the visually impaired from station entrances to trains. It has a combination of elevated, at-grade, and underground lines, and uses both broad gauge and standard gauge rolling stock. More…