Cross-section of the Hypertube test track being built for the 2016 Hyperloop pod competition.  Track is a prototype track of the various designs for the Hyperloop more generally.  Identifiable features include the steel tube, concrete base, aluminum subtrack and aluminum rail, as well as an identified keep-out zone for tube utililities.  No labels included in the png.
<a href="//commons.wikimedia.org/wiki/User:N2e" title="User:N2e">N2e</a>
<span class="int-own-work" lang="en">Own work</span>