Here are some useful tips for model trains:
1) The best way to clean the wheels & track, without using any special equipment is to use some extra fine sandpaper, and rub it over the wheels until the dirt has gone. For track, wrap the sandpaper around an appropeiate sized piece of balsa wood and rub it along the tracks.
2) Here are some goos model train sites: http://www.lifelikeproducts.com/main.htm http://www.bachmannindustries.com/