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Trains Without Tracks

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The future's so in right now: just a few weeks after Metropolis publishes their forward-looking feature on what's next in infrastructure and architecture, Popular Science enters the ring with their entrants. Among their ideas for the world of transportation, bridges that "flex on the fly," and "trackless elevated trains" that shoot through a system of rings. The idea just keeps coming back. [Pop Sci via The Dirt, previously]