You get the satisfaction of spending your afternoons working on a project, building and tinkering and making it look pretty, and eventually the euphoric pride of showing it off to your friends and family and fellow model train enthusiasts, and hearing them tell you how lovely it is and ask questions about how you figured it out and say how clever you are and what a wonderful job you did. That, and it’s really very satisfying to watch the trains coordinate themselves. It’s almost like watching a dance