"The Shanghai Metro is the urban rapid transit system of China's largest city, Shanghai... It opened in 1995, making Shanghai the third city in Mainland China, after Beijing and Tianjin, to have a subway. Since then, the Shanghai Metro has become one of the newest and fastest-growing rapid transit systems in the world. Today, there are twelve metro lines (excluding the Shanghai Maglev Train), 268 stations and over 420 km of tracks in operation, making it the longest network in the world. Daily ridership averaged 3.56 million in 2009 and set a record of 6.013 million on May 21, 2010."