Line Z4

Line Z4
Overview
Other name	Bintie Line 2 (Binhai Metro Line 2)
Status	Partly operational
Locale	Tianjin, China
Termini	Zhaishang Beitang
Stations	10 (in operation) 24 (total)
Service
Type	Rapid transit
System	Tianjin Metro
Rolling stock	CRRC Dalian 6 cars type A
History
Opened	18 January 2026 (2026-01-18)
Technical
Line length	23.738 km (14.750 mi) (In operation) 43.7 km (27.2 mi) (Total)
Number of tracks	2
Track gauge	1,435 mm (4 ft 8+1⁄2 in)
Electrification	1,500 V DC Overhead catenary
Operating speed	120 km/h (75 mph) (Maximum design speed)

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

Segment	Commencement	Length	Station(s)	Name
Zhaishang — Beitang	18 January 2026	23.738 km (14.75 mi)	10	North section

Stations

Station name		Transfer	Distance km		Location
Pinyin	Chinese
Zhaishang	寨上				Binhai New Area
Hanguyiyuan	汉沽医院
Zhongxinyugang	中心渔港
Yushadao	玉砂道
Hangmugongyuan	航母公园
Ruanjianyuan	软件园
Luchangyuan	绿创园
Heshunlu	和顺路
Zhongxinshengtaicheng	中新生态城
Beitang	北塘