Houston Metro’s Green and Purple LRT lines to open on May 23 May 14, 2015 | North America News The Metropolitan Transit Authority of Harris County (Metro) has announced that the Green and Purple light-rail transit (LRT) lines will open on May 23, 2015. The 6.4-km (3.3-mile) Green Line will conn... This content is available to only subscribers. Username or E-mail Password Remember Me Forgot Password