(ECNS) -- The first unmanned subway train in Chengdu, capital of southwest China's Sichuan Province, began trial operation Wednesday.
Chengdu Rail Transit Line 9 is the first fully automatic operation line in central and western China.
It uses the highest Grade of Automation (GoA4) operation system and can run at a maximum speed of 100 km/h.
Each carriage of the train is equipped with passenger emergency alarms.
The total length of the line is 22.18 km.