this may be a noob question but my project depends on your answer :>
One approach, (I don't know whether it's the snappiest, or most controllable)
- Copy the entire rig, track and trucks
- On the copy, delete all trucks except the copy of the one you want to remain stationary in world space.. 'Target Truck'... ( red in the illustration )
- Put a Copy Location constraint on the original track, targeted on 'Target Truck', World space, X,Y and Z, all inverted in the constraint.