CLUBS
Ives Train Society has a simple web site with a few pictures and information about the club. 
Lionel Collectors Club of America maintains a clean site with information about the club and upcoming shows. 
Lionel Operating Train Society is the club for folks who still like to play with their trains. Nice site with some layout pictures, club info and articles. 
Toy Train Operating Society is for people who operate their collector trains. Lots of club info. 
Train Collectors Association maintains the tinplate e-mail list. Get info about club events, the National Toy Train Museum, and TCA gift merchandise. 
PUBLICATIONS
Classic Toy Trains magazine's site includes answers to commonly-asked questions, lists of clubs and events, an index of past issues and much more. 
O-Gauge Railroading includes info about their magazine, videos and books. 
TM Books & Video produces popular videos of toy trains, guidebooks, and an online magazine. 
MANUFACTURERS
Lionel maintains an excellent web site with a detailed history of the company and its most famous models. Download a Lionel screen saver! 
WEBSITES
Webville & Hypertext Railroad is one of the biggest and best train and model railroad sites on the web. The list of train-related links is unbelievable!
Marc Kufflers web site. Shows his light hearted observations of his travels and hobbies in standard guage land, with train show photos and comments, layouts and friends.
Mark Miloski and his Time Machine Toys Web site Vintage Toys, Collectibles, Model Kits, Autographs, Music Memorabilia, NASA items, Advertising, Packaging, Space, Postcards, Sci-Fi & lots More!