Elon Musk has published a blog post detailing the Hyperloop concept; a solar-powered, elevated transit system that could take passengers and cars from Los Angeles to San Francisco in 30 minutes.
Here are the core designs. Bloomberg has further details.
Hyperloop passenger transport capsule conceptual design rendering (credit: Tesla Motors)
Hyperloop passenger capsule version cutaway with passengers onboard (credit: Tesla Motors)
Hyperloop capsule in tube cutaway with attached solar arrays (credit: Tesla Motors)
Hyperloop passenger capsule version with doors open at the station (credit: Tesla Motors)