Nowhere near as bad as the Red Line fire the other day, though. A cable behind a wall on the outbound Orange Line platform at State Street began to smoulder around 9:40 a.m.
I got off the Orange Line at State a few minutes later - after the train stopped briefly before pulling into the station. There was light smoke (not even as bad as the smog by the ticket counters at Back Bay on a normal day) and crews from one ladder truck and one engine studying and spraying the wall (not with water, with CO2?) near the exit to the Blue Line. The station wasn't closed; T police were there to keep people away from the wall, not evacuate the station.