Passengers pose for photos at Chaoyang Station of Subway Line 3 in Beijing ... passenger flows of over 11 million people on weekdays, equivalent to half of Beijing's population moving underground ...

The new subway lines will make things much easier," he said. Beijing's urban rail transit system operates like an underground megacity, with over 11 million passengers using the subway on weekdays.

BEIJING--Two subway stations in Beijing introduced a trial reservation system March 6 to reduce congestion during the morning rush hour and avoid having passengers wait in long lines before boarding.