I have changed wheels on 85 cars so far. Much to my chagrin I learned how very dirty plastic wheels can become. Hopefully the FVM medal wheels will stay cleaner and help keep the track cleaner. I also learned that the old Unimate hoppers had a date on the bottom and I found cars from 1986-89. Cars 22 years old! Cars 19 years old. Any of them could be comparable to today's with a few detail parts. Its hard to realize how long I've been an N-Gauge modeler. Well I did have an eight year gap when we lived in Arizona and everything was stored. Wait! There is a bright side. Look at all the money I didn't spend for eight years. Of course I've made up for it over the last three... truth be told!