Young or old, if you've experienced the magic of a model train once—particularly circling a lit tree at Christmas time—there's a good chance you're hooked for life. And if that's the case, the Old Boise N-Scale Model Railroad Club's extensive display in the basement of the Pioneer Building will be heaven on earth this holiday season. The club is offering tours of its setup, which includes multiple switch yards, hundreds of rail cars, miniature landscapes and more than 1,000 feet of track, free of charge every Saturday through Dec. 29. Families are welcome, and donations are appreciated. Chug on in for a good time.