Hey,
Just for fun, here's a train engine I did that never got textured. I also had it setup to move the wheels automagically, but with driven keys, as I find you don't have to spend time trying to find out the right equation, and I had so many "joints".
https://www.internetexcitement.com/ca...mages/TREN.jpg
sj
www.digitalplanetdesign.com