Line 9 is an east-west line running just north of the Haihe River. It runs from Tianjin railway station to Donghai Road station. It was opened in 2004, spanning with 21 stations. The line provides interchange to the TEDA Tram line. Line 9 was suspended after damage from the August 2015 explosions, and resumed operation on 16 December from Tianjin Railway Station to Tianjin Pipe Corporation Station. Now, the damaged part has been reopened, along with two new stations: Zhangguizhuang and Taihulu. The line is operated by Tianjin Binhai Mass Transit Development Co., Ltd, which becomes a subsidiary of Tianjin Rail Transit Group Corporation since 2017. Line 9's color is blue.