I tried to exit North Station this morning and found two of the doors padlocked from the outside. Not that it would have mattered if they were padlocked from the inside.
Vandalism or overzealous security, it's hard to say. 7:30 is not exactly the wee hours of the morning for commuting. In the rare (ok, not so rare on the MBTA sometimes) event of a fire or emergency, reducing the exist capacity by half seems a pretty bad idea. Maybe an alert reader with some clippers can pop over before rush hour hits in earnest.