The full Green Line Extension is open! Post published:December 12, 2022 Post category:Green Line Hundreds rode the first trains, music was played, mayors (current and former) danced, speeches were given, and Somerville became an even better place to live on this fine December day! Keep reading for more photos from Karen Molloy. You Might Also Like The Green Line Extension was supposed to open today December 31, 2011 Quick links to Green Line and Community Path press coverage December 10, 2016 Green Line meeting (and recommendations) delayed September 12, 2008