Thanks for this timely thread. I'm building an 8 x 11 bedroom layout now and am 80% complete with it and the around-the-ceiling layout. 3 of my kids are 20-25 and the other is 10, so I figure this will be more for grandchildren than children.
I think I'm going to rip out some of the insulated tracks and put in push buttons for things like the gateman and crossing gates.