I think he means this G gauge Lionel set
http://www.amazon.com/gp/product/B001VG9V7U?ie=UTF8&tag=wwwgroovykidg-20&linkCode=as2&camp=1789&creative=390957&creativeASIN=B001VG9V7U
I saw it last night at Target, quality is the same as Polar Express mentioned in the LSC link as its the same engine, but this one is definetly funner, I like the "Major Award" in the boxcar. Its an inexpensive battery operated set and for just around the tree kind of fun its fine for that, I dont think it would hold up well used outdoors for prolonged periods of time, but for Xmas it should be fine.
BTW While I like the movie and find this set 100 times more appealing than the Bipolar Express, I'm holding out for a B'manns Thomas and Percy and a sharp razorsaw.