As Chicago's elevated "Loop" is so much a part of the gritty image of the City of Big Shoulders, the New York subway system is indelibly linked with the modern conurbation that is the Big Apple. It was 100 years ago on October 27, 1904, that the first subway trip on the new system took place, and the city is celebrating the system's centennial in style. Today the system has more miles of track...
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...