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Good sceince lesson jim. I think what he meant was how do they keep the jet from lifting the truck off the tracks. ie. is it weighted or the angle of the thrust is so that the pressure is stopped by brakes. the nature of the truck, flat bottom curve top, in theory might make it possible to lift it off the ground if it was fast enough. Not enough for any real flight but it might lift of the rails a little. Maybe even go "back to the future" he he. I'm a philosophy major so this is just an educated guess from what I know about the Bernoulli principle. <br />Andrew
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