> TL;DR: Cut track weight by half, car weight by half, and total support weight by half and you get 0.125 which is suspiciously close to 0.10, the number that t

> TL;DR: Cut track weight by half, car weight by half, and total support weight by half and you get 0.125 which is suspiciously close to 0.10, the number that the article author had such a problem with. In the comments to his blog post, the OP disputes that lighter weight is going to lead to significantly lower pylon cost. I didn't look through his references, but he also has an update showing how assuming that pylon costs are going to be linear in the weight is not consistent with the hyperloop document itself. I had to reread the update a few times, but the argument is: the proposal contains two versions, for passengers and for cars. The car version will weigh more and cost more, but the cost increase is much less percentage-wise than the weight increase, so the hyperloop designers themselves don't believe that pylon will be linear in the weight. As I said elsewhere, this is why references are not just a formality. If the designers had explained where they got their cost estimates from, we could still argue about their accuracy, but we wouldn't have to speculate where they came from.