A train that drops its doors. Yes, indeed. Last time, it was a door that stayed open as the two-car "train" traveled alongside I-84 at 55 mph. This time, the "train" was slowing on approach to a Beaverton station when the door just fell off.
"The doors don't fall off" - Reason #4843 why cars are better.
Tri-Met: "To heck with maintenance, we need to build more light rail!"
Trail tip: if you must ride one of their silly little two-car "trains" - stay well away from the doors.