Everyone is watching the Washington Metro grow- from the people in the greater Washington, D. C., area who will use it to members of Congress, which has supplied federal funds and backing. But perhaps some of the most interested Metro-watchers are the citizens and officials of other big cities who have hopes for mass transit projects of their own. From a construction point of view there are some interesting lessons being learned. One of the early decisions in the planning for the Metro system was the unique design of the 53 underground passenger stations. Architecturally, these stations were designed to be artistically pleasing as well as functional. All of the movable steel forms used in station construction utilize one or more travelers for moving the forms. These travelers also provide a means for supporting the forms during placement and stripping. One design development was an improved method of form stripping. Since the coffered look of the sidewalls and arch was to be achieved with a series of tub-shaped fiberglass pans- each row facing a slightly different direction across the curved arch- it was thought at first that the pans would have to be removed one by one and then reattached for concreting the next area. However, a method was devised whereby the arch form could be collapsed without taking it apart, thus saving the high cost originally expected. The use of all these techniques has shown that various relatively inexpensive methods of forming concrete can be used to create structurally sound and architecturally pleasing underground enclosures. The economy as well as the design latitude obtained with tunnel forming techniques has proved to be a real advantage in the building of the Metro subway stations in Washington.