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  1. None of those is an example of something with a vehicle running across it, e.g. an example for mastering the vibrations of the elastic structure in practice. (I don't say it's impossible, just untested.)

  2. I don't think the tunnel would be buoyant all by its own displacement. The typical cross section of a single-track tunnel is somewhat less (c. 50 m³), but the per metre displaced water is still an order of magnitude above the per metre weight of an European train (I think you can get as high as 100 tons for 10 metres = 10 t/m in Britain [25t axleload self-emptying car for mined stuff]). However, I would estimate the tunnel walls to be much heavier. for example, the immersed tube of the Marmaray Tunnel comes in at 140 tons per metre (or 70 tons per track), and a 'double-hull', buoyed tunnel with two tubes for high-speed tracks should be heavier than that.

*Lunatic*, n.
One whose delusions are out of fashion.
by DoDo on Tue Dec 22nd, 2009 at 06:13:17 PM EST
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