This is why the trains and buses were all screwed up tonight on the way home from work. I didn't end up having to wait that long, as I arrived at Park shortly after they had satisfied whatever conditions they thought needed to be satisfied at Alewife for us all to be safe, and started running trains normally again. The announcements at Park, were, by the way, incoherent. Obviously no one is handing the officials an announcement to read or anything. They're just sort of talking, and it's not making much sense.
Can't wait to find out what the mysterious liquid was. The mysterious powder at Ashmont was cleaning powder. Perhaps the mysterious liquid will turn out be cleaning liquid. Or, maybe it was terrorism.