Image credit to compujeramey
I have red a material about the subway of the future. The author there was saying that in the future the trains below the ground will travel inside tunnels with no air inside. This will be so, because this way the friction will be reduces to minimum. This is a good idea but I am a little concerned how people will breathe if something happens and the train stops inside this tunnel. Anything might happen even having the best technical support and having the best organization. What if people need to stay few hours there? How they will breathe? I think that organizing the subway in this way is dangerous.
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