Boston–On Monday, the MBTA’s Union Square branch and Union Square Station began operation. The Union Square Branch is the first branch after 35 years. Another part of the Green Line Extension, the Medford branch with 5 stop till Tufts will open later this year. As the same part of Green Line extension with the Union Square Branch, the MBTA also debuts the renovated Lechmere Station. Before passenger board the T in Union Square and Lechmere station, passenger are require to validate their ticket before boarding. Click the video for full story. update on Apr 6th,2022