• BurlingtonNortheren-SantaFe - corporate site that contains maps and a nifty lil tracing system of cars on their lines. some of the info is buried kind of deep and hard to find...

• Union Pacific - another corporate site that has all kinds of useful info if you're willing to dig around and look for it...

• CSX - one of the majior east coast railroads. corporate homepage...

• Norfolk Southern - yet another corporate homepage...

• Conrail - corporate homepage, blah blah blah...

• Canadian National - corporate page...

• Kansas City Southern - corporate page...

• Illinois Central - corporate page...

• Wisconsin Central - corporate page...

• netREDI - dope site for tracing trains. traces trains on almost any line, anywhere in the country. only one problem - you have to be registered with them through a sponsor railroad to use the site...