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lazyant
on Jan 21, 2016
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Switzerland begins tests on the longest train tunn...
I imagine such tunnel needs vertical vents every x meters or there would be funny air compression effects or rarified air issues?
rsync
on Jan 21, 2016
[–]
They need a lot of airway and exit tunnels - and not just for compression effects - a tunnel can become a very dangerous place very quickly:
https://en.wikipedia.org/wiki/Mont_Blanc_Tunnel#The_1999_fir...
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