They also now have a fully functioning scale airport... There's a build log on YouTube (close to 30 episodes I think, all 10 - 15 minutes) following the progress, pitfalls, milestones and finally the grand opening. Only downside is its in German. It does have subtitles though.
Yeah that is awesome. Model Railroader had an article a couple years ago on it. They showed how they set up the cars to appear to be moving on their own by using magnets. At that time I don't think they had the airport built.
In the comments section under the video, it sounds like they have that covered: "There is a chained giant beneath all of this who gets out once a day and blows all over it, He is paid in klondike bars."