The Delhi Metro is a rapid transit system serving Delhi, Ghaziabad, Faridabad, Gurgaon and Noida in the National Capital Region of India. Delhi Metro is the world's tenth-largest metro system in terms of length. Delhi Metro was India's second modern public transportation system. The network consists of eleven lines with a total length of  with 214 stations, which are a mix of underground, at-grade and elevated stations. All stations have escalators, lifts, and tactile tiles to guide the visually impaired from station entrances to trains. There are 18 designated parking sites at Metro stations to further encourage the use of the system. In March 2010, DMRC partnered with Google India (through Google Transit) to provide train schedule and route information to mobile devices with Google Maps.