High-speed rail is so 20th century. Well, perhaps not in the United States, where we still haven’t gotten around to building any true bullet trains. After 30 years of dithering, California is finally working on one that would get people from Los Angeles to San Francisco in a little under 2 1/2 hours, but it could cost on the order of $100 billion and won’t be ready until at least 2028.

Enter Tesla and SpaceX visionary Elon Musk with one of the craziest-sounding ideas in transportation history. For a while now, Musk has been hinting at an idea he calls the Hyperloop—a ground-based transportation technology that would get people from Los Angeles to San Francisco in under half an hour, for less than 1/10 the cost of building the high-speed rail line. Oh, and this 800-mph system would be self-powered, immune to weather, and would never crash.

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