Line Z4 of Tianjin Metro is a metro line in Tianjin, China. Line Z4 is the largest metro PPP project in China, valued at 55.3 billion RMB. It was won by Tianjin TEDA Investment Holdings Co., Ltd and China Railway Electrification Bureau Group Co., Ltd.
On 16 January 2026, Line Z4 opened trial ride activity for the public.
The northern section was officially put into operation on 18 January 2026.
Timeline SegmentCommencementLengthStation(s)Name Zhaishang — Beitang 18 January 2026 10 North section
Stations Station name Transfer Distance Location Binhai New Area
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