Red Line: Delays of about 20 minutes due to a medical emergency at Broadway. Trains may stand by at stations. #mbtaalert #mbta

Red Line: Delays of about 15 minutes due to a disabled train at Wollaston. #mbtaalert #mbta

Blue Line: Delays of about 15 minutes due to an unruly passenger at Orient Heights. Trains may stand by at stations. #mbtaalert #mbta

Orange Line: Delays of about 15 minutes due to a disabled train at Wellington. Trains may stand by at stations. #mbtaalert #mbta

Red Line: Delays of about 15 minutes due to a medical emergency at Central. #mbtaalert #mbta

Orange Line: Delays of about 15 minutes due to police activity at Chinatown. Trains may stand by at stations. #mbtaalert #mbta

Blue Line: Shuttle buses replace service between Orient Heights and Wonderland due to a switch problem near Orient Heights. #mbtaalert #mbta

Red Line: Delays of about 15 minutes due to police activity at Park Street. #mbtaalert #mbta

Red Line Ashmont Branch: Delays of about 20 minutes due to police activity on the right of way near Savin Hill. Service is standing by. #mbtaalert #mbta

Blue Line: Delays of about 25 minutes due to a signal problem at State. Trains may stand by at stations. #mbtaalert #mbta

Orange Line: Delays of about 10 minutes due to an earlier disabled train at Ruggles. #mbtaalert #mbta

Orange Line: Delays of about 15 minutes due to police activity at Roxbury Crossing. #mbtaalert #mbta

Blue Line: Delays of about 10 minutes due to a signal problem near Revere Beach. #mbtaalert #mbta

Blue Line: Delays of about 10 minutes due to a signal problem near Revere Beach. Trains may stand by at station. #mbtaalert #mbta

Red Line: Delays of about 10 minutes due to police activity at Andrew. #mbtaalert #mbta

Red Line: Delays of about 15 minutes due to a switch problem at JFK/UMass. Trains may stand by at stations. #mbtaalert #mbta

Orange Line: Delays of about 15 minutes due to a signal problem at Forest Hills. Trains may stand by at stations. #mbtaalert #mbta

Orange Line: Delays of about 20 minutes due to maintenance personnel on the right of way at Wellington. Trains may stand by at stations. #mbtaalert #mbta

Orange Line: Delays of about 15 minutes due to smoke on the right of way at Wellington. Trains may stand by at stations. #mbtaalert #mbta

Red Line: Delays of about 15 minutes due to a disabled train near Alewife. #mbtaalert #mbta