Mexico City's Metro Line 1, the largest and busiest metro line in the city, has been temporarily suspended for a year to undergo extensive renovations, with the involvement of a Chinese state-owned company CRRC. As we approach the anticipated reopening on September 23, the line is currently undergoing its final testing phase, which is crucial to ensure everything operates smoothly. Join CGTN's Huang Yichang to take a look at some of the works currently underway, and go on a test run for the newly renovated metro line.