Chris's Transit Pics Website
   Showcases photographs of subways, buses, railroads, and monorails from a variety of locations. Also features transportation information for tourists in New York City.
   http://www.transitpics.com

Subway Navigator
   Maps and stations of subways and other heavy rail transit systems throughout the world, and a route finder detailing the path between any two stations.
   http://www.subwaynavigator.com/

The Subway Page
   Maps for subway transit systems from a number of cities all over the world.
   http://people.reed.edu/~reyn/transport.html

TubeMap.com
   Provides direct links to route maps from subways around the world.
   http://www.tubemap.com

UrbanRail.Net
   Information on subway systems organized by continent, and news, links, literature, and a gallery of general subway information.
   http://www.urbanrail.net/