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[–] 2 points 2 years ago (1 child)

Violates conservation of momentum unless the portal/train slow down.

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  • [–] 2 points 2 years ago

    Yes, but portals violate basic physics anyway.

    A portal that faces downwards into another portal is effectively a perpetual motion machine. Drop a ferromagnetic object into the loop and wrap some wires around the loop, now you have an infinite electric generator.

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