Three new lines opened as Beijing metro expands again
https://www.railwaygazette.com/operations-and-services/three-new-lines-opened-as-beijing-metro-expands-again/60659.article
It will be needed to extend suburban lines to downtown of Beijing to ease congestion of metro lines in downtown.
Especially, Daxing Airport Line ends at Caoqiao, where circular line 10 and Line 19 running radiatively from downtown are connected.
The Daxing Airport Line should be extended more to its downtown.
