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Scorpion

This loop creates some pretty strong G-forces on its entrance and exit because it is more circular than most other vertical loops.  Most vertical loops are clothoid loops which have a smaller radius of curvature at the top of the loop and a larger radius of curvature at the bottom of the loop.  Clothoid loops are teardrop shaped, but this inversion is very circular.

Scorpion train going through the vertical loop

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