Picture an elevated track of one long tube connecting Philadelphia to Pittsburgh, a sleek capsule occasionally zooming through at speeds up to 700 miles an hour.

It's no longer just Elon Musk picturing it. It's other private companies, it's governments around the world, and it's the Pennsylvania Turnpike Commission.

On The Morning Call Podcast this week, The Morning Call's Road Warrior columnist explains what the commission is exploring, and how far along other government entities already are.

Audio courtesy of Virgin Hyperloop One.

Special guest: Barry Altman, head of the commission's Hyperloop Planning Study.