SUBWAY LINES, Different routes that underground trains follow across a city., CROSSING THE CITY, Going from one side of the city to the other., NARROW STREETS, Streets that are small and do not have much space for cars., SUBWAY STATION, A place where people get on and off the subway., METRO SYSTEM, The complete public transportation system of underground trains in a city., BUSY TRAFFIC, A situation where there are many cars on the streets and movement is slow..

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