The DC Subway is a rapid transit system in Washington, D.C., United States. It is the second busiest rapid transit system in the United States in number of passenger trips, after the New York City Subway. The DC Subway system consists of six lines, 91 stations, and 117 miles of track. The two crossword solutions for the term DC Subway are 'METRO' (5 letters) and 'METROS' (6 letters). Both words refer to the DC Subway system, with 'METRO' being the singular form and 'METROS' being the plural form.