Final Train Rig

This is a video showing the final train group. Each section moves on the principle of groups. I tried working with a joint chain through the carriages using rigid binding but this appeared to affect the wheels and the axis on which they would turn depending on the translation applied. This works much more successfully where rotating one wheel on each section turns all the other wheels in that section, or in the case of the engine, animates the pistons which is rigged using an array of constraints.