However the speed limit of the first phase, which runs under the dense city center is 100 km/h (62 mph).

[8][9] Phase II extensions north and south run through suburban areas and will be built to more generous alignments allowing for 120 km/h (75 mph) operations.

[11] Phase 2 of Line 19, which is under planning, consists of a northern extension to Changping District.

The northern extension will start from Mudanyuan and run to Life Valley as a 17.6 km (10.9 mi) long section with 6 new stations.

Additionally, a southern extension was announced from Xingong to Haizijiao as a 12.6 km (7.8 mi) long section with 6 new stations along with a branch of the southern extension from Xinmeiti Chanye Jidi to Shengwu Yiyao Jidi West which will be 17.4 km (10.8 mi) long with 7 new stations.