‘Hyperloop’ travel idea gains fans if not backers

LOS ANGELES • Billionaire entrepreneur Elon Musk urged the public to polish sketch plans he released last week for a “Hyperloop” that would shoot capsules full of people at the speed of sound through elevated tubes connecting Los Angeles and San Francisco. From tinkerers to engineers, the race is on. A Utah firm hustled out a model using a 3-D printer. A Pennsylvania company is testing a virtual Hyperloop with sophisticated computer software. People for the Ethical Treatment of Animals wants ad ...

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