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In 1853 Elisha Otis climbed onto a platform which was then hoisted high above a large crowd of onlookers, nervy with anticipation. A man with an axe cut the cable, the crowd gasped, and Otis's platform shuddered - but it did not plunge. "All safe, gentlemen, all safe!" he boomed. The city landscape was about to be turned on its head by the man who had invented not the elevator, but the elevator brake. As Tim Harford explains, the safety elevator is an astonishingly successful mass transit system which has changed the very shape of our cities.

Producer: Ben Crighton
Editors: Richard Knight and Richard Vadon.