Dear Pedro, thanks for your reply. I m still at the beginning of my research so I mostly have theoretical knowledge of the VS. I ve seen a couple of systems here in Germany from Roediger. (1) Yes, I agree. Pressure gradients are inevitable in this system, I guess that is one factor limiting the vacuum main to approx. 4 km. And the need for electricity and adequate materials make this system quite advanced and pose difficulties on its management. I do believe though that its benefits in many cases outweigh the gravity system which also requires energy for lifting pumps and material failure does just go unnoticed (e.g leakage). (2) This is a great idea. I was wondering about this as well. Maybe we can discuss this as well. Please send me an email: marcbeckett@gmx.de

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Dear Pedro,

thanks for your reply. I m still at the beginning of my research so I mostly have theoretical knowledge of the VS. I ve seen a couple of systems here in Germany from Roediger.

(1) Yes, I agree. Pressure gradients are inevitable in this system, I guess that is one factor limiting the vacuum main to approx. 4 km. And the need for electricity and adequate materials make this system quite advanced and pose difficulties on its management. I do believe though that its benefits in many cases outweigh the gravity system which also requires energy for lifting pumps and material failure does just go unnoticed (e.g leakage).

(2) This is a great idea. I was wondering about this as well. Maybe we can discuss this as well. Please send me an email: marcbeckett@gmx.de