Mildly interesting
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Euthanasia Roller coaster
Link to video"The concept design of the layout begins with a steep-angled lift to the 510-metre (1,670 ft) top, which would take two minutes for the train to reach. Any passengers that wished to get off could then do so.[3] From there, a 500-metre (1,600 ft) drop would take the train to 360 kilometres per hour (220 mph), close to its terminal velocity, before flattening out and speeding into the first of its seven slightly clothoid inversions.[3] Each inversion would have a smaller diameter than the one before in order to maintain the lethal 10 g to passengers while the train loses speed. After a sharp right-hand turn the train would enter a straight, where unloading of corpses and loading of new passengers could take place.[3]"
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@taiwan_girl I love this! Brilliant!