I cobbled together a lumpy loop from two pieces of Atlas flex track, wired it up, and let'er rip. Ok, well, not let'er rip exactly, but carefully placed the loco on the track and carefully ran it with different speed settings. It runs quite well, but I need to get some rolling stock. I'm thinking a combine if I can find one of a suitable vintage.
And you're right, that is a giant screw head in that dome. I need to hide that.