Jiangsu has four cities that own their subway systems, calling metro rail network, but these systems have not been completed.
The Nanjing Metro has three lines: Line 1, 2 and 3, operated by the Nanjing Metro Company and more lines are under planning. Line 1 opened to public in September 2005 after five years of construction. In 2010, the south extension of Line 1 and the new metro Line 2 became available. Line 2 was designed to provide service of 500,000 passengers a day. More are under construction now. Still remembering in 2010 there were a lot of construction sites on streets around its downtown Xinjiekou arer. Totally Nanjing currently has 85km of metro rail network, with plans to increase this to a couple of hundred km by 2030.