The Delhi Metro is a rapid transit system serving Delhi, Faridabad, Ghaziabad, Gurgaon and Noida in the National Capital Region of India. Delhi Metro is the world's 12th largest metro system in terms of length. Delhi Metro was India's first modern public transportation system, which had revolutionised travel by providing a fast, reliable, safe, and comfortable means of transport. Presently, the Delhi Metro network consists of  of track, with 285 stations. The network has now crossed the boundaries of Delhi to reach Ghaziabad and Noida in Uttar Pradesh, and Faridabad and Gurgaon in Haryana. 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. Four types of rolling stock are used: Mitsubishi-ROTEM Broad gauge, Bombardier MOVIA, Mitsubishi-ROTEM Standard gauge, and CAF Beasain Standard gauge. According to a study, Delhi Metro has helped in removing about 390,000 vehicles from the streets of Delhi.