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 CLF and State settle lawsuit: Green Line extensions on track! November 29, 2006 Transportation board urged to move forward with Green Line September 11, 2015 Somerville News: Green Line property takings July 22, 2010