A Futuristic Proposal to Turn the World’s Oldest Subway System Into a Giant Moving Walkway

Innovative architecture firm NBBJ—which captivated us earlier this year with an idea for twin skyscrapers that cancel out each other’s shadows—has dreamed up a futuristic proposal to turn 17 miles of the Circle Line of the London Underground into a moving three-lane walkway that would give wings to human feet.

A “travelator” is merely standard British English for the kind of moving walkway you find in the world’s airports, but here it lends an appropriately sci-fi ring to the...

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