Guangzhou Metro Lines 18 opens; construction begins on northern extension, China September 29, 2021 | Asia Pacific News Passenger services have begun on Guangzhou Metro Line 18. It is the first express metro line of Guangzhou Metro with trains operating at a speed of up to 160 km/hr. The line spans 53 km (underground... This content is available to only subscribers. Username or E-mail Password Remember Me Forgot Password