5 tough questions for Hyperloop One

LAS VEGAS — Hyperloop One's 2016 was about as good as yours: Some good moments (even great ones) and some very, very bad ones. The next-gen transportation company, which is building a unique people-mover platform based on a design by SpaceX and Tesla CEO Elon Musk, had a milestone moment last spring. In the arid Las Vegas desert and with hundreds of parched journalists watching, it publicly tested the propulsion system for its planned tube-based transportation network that could cut hours-