Phase 1 (Min'an Ave. – Tangjiatuo) is 15.754 km (9.789 mi) in length (underground section is 11.075 km (6.882 mi), elevated section is 4.679 km (2.907 mi)).[3] In June 2018, debugging of the first segment of Phase I commenced.[5] Phase 1 of Line 4 began operating on December 28, 2018.
Phase 2 (Tangjiatuo – Huangling) is 32.8 km (20.4 mi) in length (21.25 km (13.20 mi) underground and 11.55 km (7.18 mi) elevated[6]) with 15 stations (10 underground stations and 5 elevated stations).[7] In 2022, debugging of this segment commenced.[8] The segment opened on June 18, 2022.[9]
^The former translation is North Square of Chongqingbei Railway Station, which has been replaced since the opening of Line 10's station
Western Extension
Under construction
The Western extension of Line 4 started construction in March 2021. It will add 9 more stations west of Min'an Ave. station. The extension is 11 km (6.8 mi) in length.[10]