The New York Subway http://www.nycsubway.org//index.html Channel Tunnel Rail Link http://www.ctrl.co.uk/default.asp The Subway Page http://www.reed.edu/~reyn/transport.html Civil Engineering: The Big Dig http://www.icivilengineer.com/Big_Project_Watch/Big_Dig/ Lost Subways http://perso.club-internet.fr/fdelaitre/Ths.htm Federal Transit Administration: Rail Technology and Systems Information http://www.fta.dot.gov/initiatives_tech_assistance/technology/2427_ENG_HTML.htm AirTrain http://www.airtrainnow.com/index1.htm This first website provides an interesting history of the New York Subway (1) as well as numerous other resources on subways. The second website focuses on the Channel Tunnel (or "Chunnel") in the UK (2), while this third website highlights subways around the world (3). Civil Engineering's Project Watch page provides a general overview and some basic information, such as the cost and timeline, for the "Big Dig" in Massachusetts (4). This interesting website reviews "lost subways" (5), including photos, articles, and other historical information. This website from FTA reviews some of the challenges involved in subway design (6 ). Finally, for a look to the future, check out the AirTrain website (7).