Boedapest
Boedapest
http://www.sztaki.hu/providers/metro4/index.en.html
Amsterdam
Amsterdam
http://www.channels.nl/metro.html
Chicago
Comprehensive resource for information on the chicago rapid transit system -- the 'l' -- including history, stations, rolling stock, maps, current news, faq, vocabulary, and more!
http://www.chicago-l.org/
Napels
sito non ufficiale sul progetto
http://web.tiscalinet.it/defalco_ivanoe/trasporti/net/index.html
New York
New York
http://www.nycsubway.org/index.html
Nurnberg
Nurnberg
http://www.nahverkehr-franken.de/ubahn/index.html