a connecting suburban Nanjing with neighboring Jurong opened on 28 December 2021. It is the first line in Nanjing Metro that reaches other cities, starting at Maqun station, ending at Jurong station. Line S6's color is lilac. Line S7 Line S7 opened on 26 May 2018. It is an extension of Line S1 further southeast, starting at Konggangxinchengjiangning station, ending at Wuxiangshan station in South Lishui District. Some Line S1 trains continue to operate into Line S7. Line S7's color is pink. Line S8 Line S8 is a suburban metro line which connects Luhe District to Pukou District. The line is long, of the line is elevated. The line features 17 stations including 6 underground stations and 11 elevated ones. It uses B size trains in 4 car sets that are capable of running up to . Construction of the line started on June 21, 2012, and it was officially opened on August 1, 2014. Line S8's color is orange. Line S9 Line S9 starts from Xiangyulunan station, the 6th station from Nanjing South Railway Station on Line S1, and extends further south to Gaochun District for a total length of . Upon opening on December 30, 2017, Nanjing became the first city in mainland China where every district is accessible by metro. Line S9's color is yellow. Under-construction projects Line 5 Line 5 received approval on 14 January 2015. Before the relocation in 2017, the line is projected to be long, containing 30 stations and to cover a route from Fangjiaying station in Gulou District to Jiyindadao station in Jiangning District. Line 6 Line 6 is a 32.4 km fully underground line with 19 stations. Construction started on 28 December 2019. Line 9 Line 9 (Phase 1) is a have a total of 16 stations, all of which are underground. The symbol of the train is orange red, and the maximum speed is 80 km/h. The route passes through Xuanwu District, Gulou District and Jianye District, and passes through Nanjing Railway Station, Xiaguan, Longjiang, Lüboyuan, Jiangsu Grand Theater and other areas. In the future, it will become an important line within the main city to connect the central Hexi, Xiaguan and Xinzhuang areas. The regional line is of great significance to the development of Hexi New City and the upgrading and reconstruction of the Xiaguan area. Construction started in May 2020, the construction period is about 4 years. The