Line S4 (Suzhou Metro)

Line S4 of Suzhou Metro (Chinese: 苏州轨道交通S4线) will be a north–south rapid transit express line. The line will run through Zhangjiagang, Changshu, Xiangcheng, Gusu, Wuzhong, and Wujiang. The line will serve as a rapid connection between the main city of Suzhou and the county-level city of Changshu, and to a lesser extent, Zhangjiagang.

Line S4
S4
Overview
Status	Planned
Owner	Suzhou Rail Transit Co., Ltd
Stations	Unknown
Service
Type	Rapid transit
System	Suzhou Metro
Operator(s)	Suzhou Rail Transit Co., Ltd
Technical
Line length	Unknown
Track gauge	1,435 mm (4 ft 8+1⁄2 in)

There is no planned construction date, but construction is expected to start before 2035.