Wow. Had to forward that one to my Dad. He's been working on his layout for quite a while now, using most of his basement. It's nowhere near as large as that, and is still very much a work in progress... http://rickbigs.blogspot.com
Even if you don't appreciate the trains themselves, the time & effort put into the layouts has to command a little respect at least.
Very cool, thanks for posting the link. The Museum of Science and Industry in Chicago has a nice/huge train lay out too, but I think this one is even larger.