Nonesense - The whole point of this tech is to eliminate air drag?? Initial idea is that some air is left in tubes, because it's easier than creating a complete vacuum and the small amount of air can help lift the pods or train. Longer term less air more vacuum better maglev - allows UNLIMITED speed ie we're talking 20,000 kph + . Energy efficiency vastly improvement since for high speed trains 95 % required to overcome drag. This would of course revolutionise transport - will require a new paradigm of construction and manufacturing based on just using robots and software, I think we're close to a tipping point that will realise this sooner than most expect, probaly within 25 years.