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Slightly OT: The train Indy and the Russian guy rode got me curious and so I looked it up...
The rocket sled was developed by John Paul Stapp who gets my vote as having the biggest set of balls ever for strapping himself to a rail mounted carriage with rocket(s) strapped on the back, going as fast as 35Gs, and then trying to decelerate as fast as his acceleration. Here's another article on Stapp.
But I don't think they placed that sled in Area 51.But while his first run had involved "no unpleasant sensations", the later runs were torturous. Even at low Gs the straps of Stapp's harness dug painfully into his shoulders. At higher ranges of acceleration and deceleration, they cracked his ribs. Over the course of the tests at Edwards, he suffered a number of concussions, lost a few dental fillings and dinged his collarbone. On a couple of other occasions, he broke his wrist. Being a physician and a bit of a stoic, he set one fracture on his way back to his office. Out of all the things Stapp was subjected to, the most disturbing (concussions aside) was blurry vision, which he began experiencing while facing backwards at speeds above 18 Gs. The cause was intuitively obvious. Blood was rapidly leaving his eyeballs and pooling towards the back of his head in response to gravity, resulting in a "white out." During later tests, when he faced forwards and the blood was pushed up against his retinas, Stapp would experience "red outs" caused by broken capillaries and hemorrhaging. Clearly, when it came to G forces the most vulnerable part of human anatomy were the eyes.