Line 4 (Jinan Metro)
Jinan Metro Line 4 is a rapid transit line of Jinan Metro system. Construction of Line 6 first phase started on 6 March 2021.. It officially opened for passenger service on 27 December 2025 at 10:15 am, with Line 6 east section and Line 8. The line spans 40.2 km long, all 33 stations are underground. And it is also the longest line of Jinan Metro system, serving the most densely populated areas, it connects key areas including the old downtown, the Central Business District, and Tangye New district.