HI, I had a American Flyer train set that had the American Flyer Rocket engine #474 and 475, with passenger cars # 960, 961, 962, 963. The set had no track transformer or any of the boxes for the engine or cars or set box. I sold it for $400.00
Hope this helps you.
One really needs more information like condition? Original boxes? The boxes condition?
In 2005 Live Auctioneers sold a set complete with boxes for $1500. Today, for the same set I would imagine near half that price, maybe a bit more ..... $1k?