Links:

RailServe.com
http://www.railserve.com/

Building Your Model Railroad
http://www.building-your-model-railroad.com

The Friends of the Nevada State Railroad Museum (NSRM)
http://www.nsrm-friends.org/index.html

Nevada Southern Railway
http://www.nevadasouthern.com/

Nevada Northern Railway
http://nevadanorthernrailway.net/

Westside Trains Store
http://www.thetrainengineer.com/

Wikepedia: Model Train Scales
http://en.wikipedia.org/wiki/Category:Model_railroad_scales

Trainorders.com
http://www.trainorders.com/

Red Star Railways
http://www.redstarrailways.com/

Modelrailroads.net
http://www.modelrailroads.net

TrainTraveling.com
http://www.traintraveling.com