Attack of the 60-foot Oscar winner

The T now has two recorded announcements before a train pulls into a station. One says that "the next Orange [or whatever color] Line train is now approaching," and about 15 seconds later we get "the next Orange Line train is now arriving." I don't know the purpose of having dual announcements. The "approaching" one sounds like a warning. ("The next gigantic reptile is now approaching, and he's hungry!") So I find myself cringing a bit when I hear that the beast is "now arriving," giving us no time to run for our lives. At least I know longer think of a good friend's impersonation of Katherine Hepburn when I'm on a subway platform. He likes to portray the linguistically proper New Englander at the moment of maximum sexual excitement: "Oh, Spencer! I'm arriving! I'm arriving!"