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I've worked with high vacuum systems and once you get the vacuum established, it takes very little energy to maintain it unless the system develops a leak.
This transportation system is good in that it isolates the high speed capsule from the surrounding environment so it would avoid the problem with bird strikes and of animals, falling trees, etc. getting on the track that you have with high speed trains.
On the other hand how would it handle an earthquake if one occurred while a capsule was under way at full speed. If it caused an vacuum leak, the resulting air drag/ compression would slow the capsule down, but how much vibratory motion of the tube could the system handle before the capsule struck the walls of the tube and started bouncing along the sides of the tube.
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