On August 5, it was reported that the construction of kunming metro line 4 was speeding up again. The right line tunnel between xiaocaiyuan station of kunming rail transit line 4 and north railway station was successfully completed by China railway no. 5 bureau. Up to now, 57 of the 60 single lines of line 4 have been connected.

The railway from Lhasa to nyingchi was completed on the afternoon of August 2. This is another large tunnel of lalin railway with an altitude of over 3,000 meters successfully completed, marking another stage breakthrough in key and difficult projects.

July 31, guangzhou metro line 18 and 22 ushered in a major critical node! With the shield tunneling of "tiebing 40" with a diameter of 8.8 meters breaking through the wall, the right line between west pazhou station and xiancun station successfully realized the initiation of shield tunneling.

In the early morning of July 30, 2019, with the roar of the cutter head of "endeavour 4" shield tunneling machine, the shield tunneling machine of chengdu west station -- huangtianba station of chengdu rail transit line 9 broke through the earth at the receiving end, marking the "tunnel access" of the whole line.