Line 4 (Xiamen Metro)

Line 4
Overview
Other nameOuter Bay Ring Express Line[1]
StatusUnder construction
OwnerXiamen Metro
LocaleXiamen, Fujian, China
Termini
  • Xiang'an Airport
  • Jimei Software Park North
    Songyu Wharf (Future)
Stations12 (Xiang'an Airport section phase 1) [2]
21 (total)
Service
TypeRapid transit
SystemXiamen Metro
OperatorXiamen Metro Xiamen Metro
DepotHouxi depot[3]
Technical
Line length44.78 km (27.83 mi) (Xiang'an Airport section phase 1) [2][4]
71.23 km (44.26 mi) (total)[5]
Number of tracks2
Track gauge1,435 mm (4 ft 8+1⁄2 in)
Electrification1.5 kV DC Overhead catenary contact
Operating speed120 km/h (75 mph) (Maximum design speed)[2]

Line 4 of Xiamen Metro is an under construction metro line in Xiamen, Fujian, China. The Xiang'an Airport section is scheduled to operation in June 2026[2]. As the fastest fully automated metro train currently operating in Xiamen, travel time from Xiamen North railway station to Xiang'an Airport will be reduced to 30 minutes[2][6].

This is the first subway line of Xiamen Metro system which adopts GoA4 automation level[7].

Among the distance of 44.78 km (27.83 mi) on the Phase 1; 22.48 km (13.97 mi) is an underground section, 20.95 km (13.02 mi) and 1.35 km (0.84 mi) is a transition section[8].

History

The key engineering projects for Line 4 were announced in December 2015[1].

Construction began in December 2015 with an estimated total construction period of 57 months[9].

On the morning of 11 April 2020, the 1.36 km (0.85 mi) bridge elevated section from Caicuo to Dadeng North was completed[4].

On 16 April 2024, the main structure of Airport West Station of Line 3 and Line 4 were successfully topped out[10].

In August 2024, the rolling stock set of Line 4 officially debuted[6].

On 26 November 2024, Line 4 rolling stock began testing without passengers[11].

On 10 October 2025, Line 4 began trial operation[12].

Stations

Section Station name Transfer Distance

km

 Location
English Chinese
? Songyu Wharf 嵩屿码头 Haicang
Nanhai Road 南海路
Linggang Xincheng 临港新城
Phase 2 Maluan Bay South 马銮湾南
Maluan Center 马銮中心  2 
Maluan Bay North 马銮湾北
Guankou 灌口 Jimei
Software Park Phase 3 East 软三东
Phase 1 (Xiang'an Airport section)[13] Jimei Software Park North 集美软件园北
Houxi 后溪
Xiamen North Railway Station 厦门北站  1  Xiamen North Railway Station XKS
Xiamen BRT
Guanxun 官浔 Xiamen BRT Tong'an
Bingzhou 丙洲
Chengchang 城场 Xiang'an
Xiyan 西岩
Hongkeng 洪坑  3 
Qianwu 前浯
Dongting 洞庭
Airport West 机场西  3 
Xiang'an Airport XMN
Xiang'an Airport 翔安机场 Xiang'an Airport XMN
Phase 1 long term planning Airport East 机场东 Xiang'an Airport XMN

Rolling stock

In the first phase, 18 four-car train set produced by CRRC Changchun adopts GoA4 automation level will be implemented to meet the demands[1][14][3].

Future expansions

Phase 2 of Line 4 has been approved, with a total investment of 10.1 billion RMB. Phase 2 consists 5 stations, spanning 14.8 km (9.2 mi) long. It is expected to be completed in October 2028[9][8][15].

References

  1. 1 2 3 "厦门地铁4号线，一条正在建设的岛外环湾快线，一期2026年6月开通". 23 June 2025.
  2. 1 2 3 4 5 "奋战开门红丨市域铁路象山线全线盾构区间贯通". 12 April 2026.
  3. 1 2 "地铁4号线全线车站封顶 2026年全线试运行". Retrieved 30 September 2024.
  4. 1 2 "快讯！厦门地铁4号线有重大突破！蔡厝站至大嶝北站跨海区间今日贯通". 11 April 2020.
  5. ↑ "厦门地铁4号线专题之：灌口站、集美软件园站房地产价值解读". Retrieved 19 March 2020.
  6. 1 2 "厦门地铁4号线全自动驾驶列车亮相". 7 August 2024.
  7. ↑ "刚刚，厦门地铁4号线最新进展！会经过这些地方……". Retrieved 26 November 2024.
  8. 1 2 "厦门地铁4号线最新消息（站点+规划+通车时间". 24 September 2025.
  9. 1 2 "厦门地铁4号线最新消息（站点+规划+通车时间）". 24 September 2025.
  10. ↑ ""三航造"厦门地铁3/4号线机场西站主体结构封顶". Retrieved 18 April 2024.
  11. ↑ "刚刚！上线调试！厦门地铁4号线最新消息". Retrieved 26 November 2024.
  12. ↑ "厦门地铁4号线已启动试运行". Retrieved 23 October 2025.
  13. ↑ "最新公告！事关厦门地铁3、4、6号线". 28 March 2025.
  14. ↑ "全自动驾驶！厦门地铁，最快列车来了！". 19 July 2024.
  15. ↑ "Construction of the second phase of Xiamen Line 4 is scheduled to begin in 2023". Retrieved 9 October 2022.
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