I have a small layout that I have been working on for awhile now, and I would like to experiment with car routing procedures. I have heard ofthe car card routing system but I don't know much about it or seen it work in action. Is there a good web site that describes different approaches to freight car routing for model trains? I would prefer to use a an approach that has a good balance between being realistic, but not overly complicated, time consuming to set up, or expensive. If someone knows about shareware routing software, that would be good to know about also. Thank you!