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

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

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/

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/