Trees can hide a lot of backstage stuff. This is how I imagine it would be implemented. I'm not saying it will occur at a bit of track like this but it's easier to illustrate.
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This allows for a longer time with the Kuka Arm scene and allows for it to return to it's original position quickly for the next train arriving.
At any kind of speed, you could throw a crappy Ron and Harry AA in the car and nobody would be able to tell and still get the desired effect.