Railroad Tycoon II

Oliver Keating's Railroad Tycoon 2 Strategy
Provides strategy guides, including campaign strategies, and background information on the game.
http://www.o-keating.com/rrt2/

Railroad Gamer
Newsletter covering railroad games (with archives) that provide tips on game levels.
http://members.aol.com/rrgames/

Robber Baron
Offers a strategy guide, historical information and biographies, a gallery of real trains, and downloadable maps.
http://www.express-world.co.uk/robberbaron/

Train 'n' Money
Features trainers, patches, game maps, screen shots, FAQs, and tips and hints.
http://www.geocities.com/SiliconValley/Bay/2488/rt2/