Washington, D.C.
Washington also has two or three subway lines that connect government buildings. One is an open air tram while the other(s) are mini-subways, such as the two station Senate Subway People Mover.
  • WMATA's Home Page
  • There's more info on the updated Senate subway on Lea + Elliott's site.
  • A unique image from Paul Samuels

  • The Forest Glen Metro Station
     Case Study: The Senate Subway People Mover System