A bending (disintegration) of the train occurs in Adam's reference frame but doesn't in Sarah's, which is an absurdity: https://youtu.be/Xrqj88zQZJg?t=513

Deducing an absurdity shows that the underlying premise, Einstein's constant-speed-of-light postulate, is false (reductio ad absurdum).

If reductio ad absurdum were operative in physics, jumping 60 million years ahead in the future and trapping unlimitedly long objects inside unlimitedly short containers would convince everybody that the underlying premise, Einstein's constant-speed-of-light postulate, is false:

Thibault Damour: "The paradigm of the special relativistic upheaval of the usual concept of time is the twin paradox. Let us emphasize that this striking example of time dilation proves that time travel (towards the future) is possible. As a gedanken experiment (if we neglect practicalities such as the technology needed for reaching velocities comparable to the velocity of light, the cost of the fuel and the capacity of the traveller to sustain high accelerations), it shows that a sentient being can jump, "within a minute" (of his experienced time) arbitrarily far in the future, say sixty million years ahead, and see, and be part of, what (will) happen then on Earth. This is a clear way of realizing that the future "already exists" (as we can experience it "in a minute")." http://www.bourbaphy.fr/damourtemps.pdf

https://pbs.twimg.com/media/De9fBJwWkAEMaXZ.jpg

"These are the props. You own a barn, 40m long, with automatic doors at either end, that can be opened and closed simultaneously by a switch. You also have a pole, 80m long, which of course won't fit in the barn. [...] So, as the pole passes through the barn, there is an instant when it is completely within the barn. At that instant, you close both doors simultaneously, with your switch. [...] If it does not explode under the strain and it is sufficiently elastic it will come to rest and start to spring back to its natural shape but since it is too big for the barn the other end is now going to crash into the back door and the rod will be TRAPPED IN A COMPRESSED STATE inside the barn." http://math.ucr.edu/home/baez/physic...barn_pole.html

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