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I think it's an attempt to get more people talking about transport in general. Most people hear "train from LA to SF" and switch off. But if it's a "superfast air tube that shoots you from LA to SF in a pod!", people become interested fast. Then you can introduce the idea of trains or other services as alternatives. Releasing it at an early stage like this is also a good way to get the government to consider it properly. Once you start getting the general public excited about a transportation system, they're going to sit up and take notice.