On the morning of September 1, the first car of the first and second phases of the line 6 and the third phase of the no-load trial operation of the line 6 slowly drove out of the library with a loud whistle. So far, Chengdu Metro Line 6, the longest all-underground rail transit line in western China, has officially put into no-load trial operation, marking that the 7 new lines planned to be opened within this year of Chengdu Metro have all entered the no-load trial operation stage. The implementation of the transportation "accelerated network" strategy has officially entered the "countdown" stage.