20240605 14001800 1.0 TRUE Baltimore Metro Subway Line Maryland Transit Administration METRO routes. The 15.5-mile, 14-station Metro Subway system operates every. 8-10 minutes during the morning and evening peak periods; 11 minutes during weekday evenings; 15 minutes on Saturdays, Sundays and holidays. See http://mta.maryland.gov/metro-subway for more information. MD iMAP, MTA