Photos from mock groundbreaking Post published:October 20, 2011 Post category:Green Line Thanks to all who came to the mock groundbreaking tonight protesting the delays of the Green Line Extension. Somerville is shovel ready! Click for more photos. You Might Also Like Arlington Advocate: Green Line supported April 2, 2008 The Green Line Extension was supposed to open today December 31, 2011 State Rep. Christine Barber on why the Green Line needs to go to Route 16 November 10, 2017