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In London they have a different kind of height detector. Because parts of the "tube lines" (smaller clearence, mostly round tunnels) are shared with "subsurface" (larger trains, runs closer to the surface, in older tunnels), or even mainline (as in "not London Underground"), there has to be SOME way to keep the overheight trains from smashing themselves in the tube. A metal gantry with u-shaped glass tubes hanging from it lies over the track, just before the last platform before the tunnel. An overheight train will smash it, causing red signals to appear, and cutting the power. So far none of these have been tripped. <br /> <br />~Ra'akone
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