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metro
This term evokes a sense of urban density and rapid movement. It is most frequently used in an international context to describe high-capacity transit systems that define the heartbeat of a metropolis, contrasting with slower, surface-level transport. When used as an adjective, it functions as a shorthand for metropolitan, shifting the focus from a specific train line to the broader geographic and social sphere of a city and its fringes. It carries a connotation of connectivity and administrative scale.
Countable when referring to a specific transit system or a single train car. Uncountable when referring to the general concept of urban rail transport.