The MBTA switched back to bustitution between Copley and Babcock Street on the B Line this morning after a trolley derailed near Kenmore Square shortly before 9 a.m. Also:

Cleveland Circle and Riverside trains will terminate at Kenmore. Westbound service will be rerouted to the E Branch at Copley. Riders can also use local bus route 57 for service between Babcock St and Copley.