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 Coverage of maintenance facility hearing December 21, 2009 Photos from mock groundbreaking October 20, 2011 Green Line preliminary engineering and design contract: $24.5 million August 1, 2010