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 Silence, lack of public input when it comes to the Green Line extensions October 29, 2008 Notes from Gilman Square & Lowell St stations design meeting June 5, 2013 State transportation bond bill includes Green Line funding! November 29, 2007