At the train show in Deland Fl. a couple Saturdays ago I ran across three Lionel Florida East Coast GP7's in one display box. It turns out that they are a lash-up set 6-25809. Two power units and one dummy unit and all three TMCC equipped, the dummy unit with forward and reverse lights and strobe light on top. The power units are single motor but heavy enough to pull a few cars, they showed just a little track wear. All for $200.
I can't get the lash-up function to work but that's okay, I'm enjoying running them side by side.
In the video the dummy unit in on the inside track.
Doug