The vehicles are on a track. They'll build the new 'story' around where those tracks go. They won't change the current placement of the tracks.
The movement of the vehicles then get programmed as to stop and go and sideways spine breakers.
A PR department uses hyperbolic language?!?!?! <clutches pearls>
Next, you'll tell me they use superlatives, too, such as "happiest" and "most magical"!! Why, 'magic' doesn't even exist!!!