Went back to the train rig to find we were going to have some problems. Basically the rig went weird when you applied any kind of movement to the train so I've gone back and rescaled it down to make everything smaller. Then basically I've grouped the sections and added a joint chain with rigid binding so now we have this really simple way of twisting and turning the carriages which will be so important in the mines. Also means we could do more with curves in the desert scenes if we wanted to add more. Basically I now have to redo the rigging but it will make the rig much more intuitive and easy to use. And we can have much more fun with it animating!