You can out-walk parts of the Green Line Extension

On portions of tracks adding up to more than a mile, Green Line Extension trains are moving at only 3 miles per hour. The MBTA says these slow zones are a response to recent tests that show portions of the tracks are narrowing. It's a problem that many transit experts say is unheard of for train lines this new.

Boston Globe transportation reporter Taylor Dolven broke this story last week. She joins The Common with more on what we know, and don't know, about the condition of the GLX, and how it's impacting the communities that rely on it.