The security never ends...

I've heard a security announcement several times in serveral different métro stations around Paris. The announcement is broadcast first in French, then English, followed by Spanish and includes the phrase, in English; "In the interests of terminal security..." and I can't help but ponder this. It's not really a terminal, is it? There are terminals at airports, but not in métro stations. Even the last station on a line is called the "terminus". Unless the word "terminal" in this announcement is used in the sense of "terminal illness", therefore meaning that the security is going to be with us until the end and there's no solution for it.