MyLargescale.com
Large scale model train forums and classified ads. Requires registration for use.
http://www.mylargescale.com

Outer Limits Garden Railroading
Includes information on large and small scale and live steam trains, and related links.
http://www.geocities.com/OS2Dude/LargeScale.html

Colorado Gardening: Garden Railroads Double Gardening Fun
Article with photographs and links.
http://www.coloradogardening.com/articles-rr_article.htm

Hallas.com: Learn Garden Railroading
Beginners guide to constructing a garden railroad and steam operation. Includes plant guides and themes, power options, photo gallery, and links.
http://hjem.get2net.dk/hallas/

G Scale Mad
British garden railways, including forums, shows and event listings, articles, reviews, photographs and videos, and links.
http://www.gscalemad.co.uk

The Big Train Show
Annual sales show held on the Queen Mary in Long Beach, California each year in June. Also offers clinics and tours. Includes schedule of events, photographs of previous shows, links to exhibitors, and registration form.
http://www.bigtrainshow.com/

Morris Arboretum: Garden Railway
Annual summer exhibit at the University of Pennsylvania.
http://www.business-services.upenn.edu/arboretum/gardenrailway2.html

Fairplex Garden Railroad
Begun in 1924, the 3,500 square foot model railroad in Los Angeles is open to the public one day per month. Includes history and tour.
http://www.fgrr.org/index.html

Trains.com - Garden Railways
Includes articles from printed issues of Garden Railways Magazine.
http://www.trains.com/grw/