Mark, when my wife started dropping things it was usually an early sign she was "with child". I think you are beyond that stage like me.
As you know I have 3 bridges on my layout. I sometimes forget to reset/replace the other two when I am test running. One day I almost had the crash into the canyon because the track led to the floor. Fortunately the engine ran off the track and stopped before making the plunge - hanging there looking into the chasm. I would have been a most unhappy fellow if that had happened. Very close call. Jeff