— Photo courtesy of MBTA GLX

MBTA has announced service has resumed between Union Square and Lechmere. 

Green Line D Branch: Regular service between Union Square and Lechmere has resumed after an earlier signal problem near Union Square.

Earlier announcement:

Green Line D Branch Update: Service is temporarily suspended between Union Sq. and Lechmere as personnel remove a trolley from service and resolve a signal problem near Union Sq. Take Route 87 buses between Union Sq. and Lechmere for alternate service. https://twitter.com/MBTA/status/1774877569650729328