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 Envision Green Line station locations (in 3D) at inTeractive Somerville December 5, 2010 Green Line public meeting January 31, 2019 Green Line walks at Ball Square and College Ave December 6, 2010