Since it was first proposed in 2013 by Elon Musk, companies and universities have been racing to build a working prototype of a Hyperloop system, which some people hope will revolutionize inter-city transportation. There's still a ways to go. Neither the pods nor a full track have been built yet. The brakes haven't either (the sled is still crashing into sand to slow it down). But there's a motor, and that's a start!