Tunnelling works of Tianjin Metro Line 6 Phase II conclude, China March 3, 2021 | Asia Pacific News The tunnelling works of Tianjin Metro Line 6 Phase II have been completed within 334 days. Phase II spans 14.34 km and covers nine stations. Passenger services are expected to begin by end-2022.... This content is available to only subscribers. Username or E-mail Password Remember Me Forgot Password