The Green Line Extension is pictured on a new MBTA map at Ruggles station in April 2021, several months before the line’s opening. Photo by Edward Orde, via Twitter.
The new map shows the six new stations of the Green Line extension, with the Riverside "D" branch running to Union Square, and the Heath Street "E" branch running to Medford:
A detail of the new Green Line "B" branch map with fewer stops, pictured on a new MBTA map installed at Ruggles in April 2021. Photo by Edward Orde, via Twitter.
The new map also shows the new Chelsea commuter rail station with its direct transfer to the Silver Line, and fewer stops on the Green Line's "B" branch through the Boston University campus, where the T is in the midst of consolidating four street-level stops into two new, ADA-accessible stations with elevated platforms.
A calendar of major diversions and closures associated with various maintenance projects reveals that the Union Square branch (along with the new Lechmere station and rehabilitated Lechmere viaduct) is expected to open in October, while the longer Medford branch is expected to start taking riders in December:
A detail of the MBTA's summer work calendar, shared in an MBTA board meeting on March 29, 2021, reveals the agency's expected opening dates for the new Green Line Extension.