Trolleys in crisis: MBTA says power wire on brand-new Green Line Extension failed 'prematurely;' older wires elsewhere failed because they can't deal with sudden shifts in weather - Universal Hub

The MBTA said yesterday it's identified the overhead power-line issues that have led to a recent spate of dead trolleys from the new Green Line Extension to the ancient tracks near Copley and on Beacon Street. The T also said it's working to keep them from ha…