Feasibility study of Shenzhen Metro Line 3 Phase IV approved, China July 22, 2020 | Asia Pacific News The Shenzhen Development and Reform Commission has approved the feasibility study of Shenzhen Metro Line 3 Phase IV. Phase IV will span 9.28 km and cover seven stations (six underground, one elevated)... This content is available to only subscribers. Username or E-mail Password Remember Me Forgot Password