Infographic below.

The Hyperloop, a proposed system of high-speed cross-country travel that could someday replace trains and even domestic flight, will enter testing later this decade.

The project will be developed and operated by Hyperloop Transportation Technologies (HTT), a 'crowdsourced' company launched in 2013.

The brainchild of Elon Musk, founder of Tesla Motors and SpaceX, the Hyperloop was first detailed nearly two years ago in a 57-page document that outlines a 10 year development and construction program with a $6 billion budget.

Although an expensive proposal, the Hyperloop would still be considerably more affordable than the $68 billion earmarked for a new train line in California.