[lisper]

The hyperloop's thermal problems are not the result of day-to-day swings, they are the result of overall swings. This is because the entire track has to be a single length of welded steel tubing. The thermal expansion at the ends is just ridiculous -- hundreds of meters. It doesn't matter if this happens over the course of a day or over the course of a year, it's still going to be a show-stopper.