Green Line test trains are running! Post published:December 4, 2021 Post category:Green Line Here’s a test run into the new Union Square station. The Green Line is coming soon! You Might Also Like Mayor’s letter to DEP about Green Line October 21, 2004 MBTA Rider Oversight Committee’s comments on Green Line September 19, 2007 Green Line Extension Design Working Group meeting November 24, 2010