» Building the Washington Metro    Describes the planning, engineering, architecture, construction, and operation of the subway system in text and photos.    http://chnm.gmu.edu/metro/

» D.C. Underground    Information about existing subway tunnels, including those no longer in daily use. Also features information on local heavy rail structures and the U.S. Capitol building's subway.    http://www.clouse.org/

» DCRails.com    Uses Google Maps to find the closest Metrorail stop to a given address.    http://dcrails.com

» NYCSubway.org: Washington D.C. Transit    Gives an in-depth look at the Metrorail system, from fare collection to signal systems to station architecture. Provides historical timeline, station-by-station guided tour, photos, maps, and links to similar sites.    http://www.nycsubway.org/us/washdc/

» Please Stand to the Right    Sells T-shirts and other merchandise urging tourists to stand on the right side of Metro escalators.    http://www.standtotheright.com/

» StationMasters    Features detailed maps and panoramic photos of all neighborhoods served by the Washington, DC Metrorail subway system.    http://www.stationmasters.com/System_Map/system_map.html

» WMATA - Metrorail System    Maps, station information, and how to use the Washington Metro.    http://www.wmata.com/riding/using_metro.cfm

» Washington, D. C.    Metrorail Resources page provided by the Washington Post (commercials included).    http://www.washingtonpost.com/wp-srv/local/longterm/metro/uchoose.htm