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Speed is only possible when track is smooth and straight. Whether high or surface mounted, rail(s) that bend or bump cause suspension (wheels etc.) systems to break. Look at the Amtrac recent experience on two rails! Most mag and mono rail systems have three working sides; i.e., left, right, and down. Thus I see them very similar to the Roman ruts. Even a duck feels R=V squared over 2g. Lindsay
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