Details on Green Line retaining walls and noise barriers Post published:May 30, 2012 Post category:Green Line MassDOT has posted its presentation on retaining walls and noise barriers, from the May 22 public hearing. You Might Also Like VHB selected for Green Line environmental impact report October 10, 2007 Boston Globe: Green Line and economic development November 23, 2009 More coverage of Capuano’s unfortunate words on the Green Line December 14, 2011