Ok I got a working solution for the tracks. I can make them move as the should in Maya but it's still a bit of a pain to key them properly. I've almost finished the modelling and so now I have the nasty nasty task of laying out the UVs which for me is the biggest stumbling block of any project. I will bring in some pics tomorrow of where I'm currently at.

Thanks for all the good comments so far I may just get this one finished

Alan