| Line S4 | 
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|  | 
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| Status | Planned | 
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| Owner | Suzhou Rail Transit Co., Ltd | 
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| Stations | Unknown | 
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| Type | Rapid transit | 
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| System | Suzhou Metro | 
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| Operator(s) | Suzhou Rail Transit Co., Ltd | 
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| Line length | Unknown | 
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| Track gauge | 1,435 mm (4 ft 8+1⁄2 in) | 
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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.[1]
There is no planned construction date, but construction is expected to start before 2035.
References
| Public transportation in Jiangsu (JS) | 
|---|
|    Nanjing Metro | | Lines in operation |  | 
|---|
 | Under construction | 
 3  (Phase 3) 4  (Phase 2) 6  9  10  (Phase 2) 11  S2  S4  (Nanjing section) S5 
 | 
|---|
 | Under planning | 
 2  (eastern extension) 3  (Phase 4) 4  (Phase 3) 8  9  (Phase 2) 10  (Phase 3) 16  18  S3  (eastern extension) S6  (western extension)
 | 
|---|
 | 
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|    Suzhou Metro | | Lines in operation |  | 
|---|
 | Under construction | 
 2  (northern extension) 4  (northern extension) 7  (northern extension) 10  (S5)
 | 
|---|
 | Under planning |  | 
|---|
 | 
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|    Wuxi Metro | | Lines in operation |  | 
|---|
 | Under construction | 
 S2  4  (Phase 2) 5  (Phase 1) 6  (Phase 1)
 | 
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 | Under planning | 
 2  anzhen 5  (Phase 2) 6  (Phase 2) 3  (North extension) 3  (South extension) 3  Branch line 4  (Phase 3) 7  8 
 | 
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 | 
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|    Changzhou Metro | | Lines in operation |  | 
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 | Under construction |  | 
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 | Under planning |  | 
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 | 
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|  Xuzhou Metro | | Lines in operation |  | 
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 | Under construction |  | 
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 | Under planning |  | 
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 | 
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|  Nantong RT |  | 
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|    Shanghai Metro (Jiangsu Section)
 |  | 
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|  Shanghai Suburban Railway (Jiangsu Section)
 |  | 
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|  LRT & trams |  | 
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| Transportation hubs | |  Int'l airports |  | 
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 |  Railway stations |  | 
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 | 
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China: AHBJCQFJGD/HK/MOGSGXGZHAHBHEHIHLHNJLJSJXLNNMNXQHSCSDSHSNSXTJXJXZYNZJ
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