Chengdu opens express metro
https://www.railwaygazette.com/projects-and-planning/chengdu-opens-express-metro/57476.article
It's interesting that Chengdu Metro Line 18 itself is Express Metro, if we compare it with paralleling Line 1.
But on Line 18, there are still 2 types of the trains. One is express, and the other is the all-stations.
As far as I know in China, it's the first time for me to see 3 types of the trains in fact are operated at high frequency.
