The answer to the crossword for the term N.Y.C. SUBWAY, WITH 'THE' is LEX, which stands for the Lexington Avenue Line. The Lexington Avenue Line is a rapid transit line of the New York City Subway system, running from Lower Manhattan north to 125th Street in East Harlem. It is the busiest line in the system, carrying over 500, 000 passengers per day. The Lexington Avenue Line is served by 6 express and 4 local services.