Shenzhen opens two metro lines in one day
https://www.railwaygazette.com/shenzhen-opens-two-metro-lines-in-one-day/57178.article
With this opening, quadruple-track railway newly opened in Shenzhen. The section is between Futian checkpoint and Fumin. The quadlruple track consists of Shenzhen Metro Line 4 and Line 10.
Other than this section, The section between Chegongmiao and Hongshuwan South has also been quadlruple track.
