Yesterday, the first underground station of the Tianjin rail transit Z4 constructed by the Forth Bureau-Jinlin Road station was capped. Rail Transit Line Z4 is a backbone line connecting the north and south areas of Binhai New District with the core area. The total length of Phase I of the project is about 43.7km, with 24 stations, 12 underground stations, 11 elevated stations and 1 ground station.