Underground rapid transit systems that carry trains or other vehicles beneath a city's streets; plural of subway.
From sub- (Latin for 'under') plus way. Subway is a shortened form of 'underground railway.' The word was coined in America in the early 1900s as city transit systems expanded below ground.
Subways are secretly some of the coolest engineering ever—the tracks have to account for 150+ years of vibration from millions of trains, and engineers use computers to monitor if the tunnels are shifting even a millimeter! They're like underground time machines.
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