The Big Railroads
U.S., Canada, Mexico

Milwaukee Road's Pacific Extension

Union Pacific

Burlington Northern & Predecessors

Western Pacific

Santa Fe

Chessie in Michigan / Car Ferries


Southern Pacific

Rock Island

Illinois Central Gulf

National Railroading:

A Train Order Primer

The Freedom Train

Los Ferrocarriles Mexicanos

Also see the Maps and Timetables page for RR's not listed here

For more photos of northwestern U.S. railroads, visit Rob Jacox's Western Rails.

Another good site with tons O' photos of North American railroads is RailPictures.Net.