Bent-Brent, that was tried in the '20's, I think. Maybe before then. It can be described with one word: FAILURE. It was be done though, in ideal conditions, but those never exist.
An awesome element would be a launch from the station @ 80mph, and up 90 degrees just like Hypersonic, but instead of going over the top of a hill, it flips backwards and you go down at a 95 degree angle (so the people in the back can see well) which levels out 50 feet below the station in a tunnel with some awesome lighting effects.
To make it better, the "loop" is just tall enough for the train to get over it at 5mph, so you hang there for a couple seconds. Then at the end, it pulls you up another 90 degree hill, to make you go through it backwards, unless of course it is an element used on a regular coaster, and not a shuttle (but I can only think of two non-shuttle launched coaster, so more than likely, it would be a shuttle.)
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V2, Deja Vu... how can it be better? Add Viper! Oh, wait. It's already there!