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For high-speed trains, the dominant noise source is aerodynamic noise, so underframe noise protection is insufficient. On conventional lines, you would need to empty the bottom corner of the loading gauge, which includes stuff like safety equipment, walkways (in particular in tunnels) and simple platforms on un-refurbished stations.

*Lunatic*, n.
One whose delusions are out of fashion.
by DoDo on Mon Oct 1st, 2012 at 04:31:24 PM EST
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