Line S4 (Suzhou Rail Transit)

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

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

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