PBS special covers the Big Dig – and Green Line extensions Post published:October 27, 2008 Post category:Green Line Quoted in the segment is Ellin Reisner, president of STEP. Read more and watch the video. You Might Also Like Green Line Environmental Assessment released October 4, 2011 City of Somerville statement on Green Line delay September 23, 2011 Green Line bridge construction underway May 6, 2013