Here are a list of web resources I find valuable.

General

• National Model Railroad Association

Electronics

• Arduino.cc
• Fritzing.org
• DFRobot
• Digikey Electronics
• Osh Park – PCB Manufacturer

Literature

• Model Railroader
• Railroad Model Craftsman
• Model Railroad Hobbyist
• Kalmbach Hobby Store

Shopping

• Walthers
• Model Train Stuff
• Woodland Scenics
• Digitrax, Inc.
• Atlas Model Railroad Co.
• Bachmann Trains
• Kato USA
• Scale Trains/
• ExactRail
• Accurail
• Campbell Scale Models
• N Scale Architects
• Diamond Scale Products
• Railroad Backdrops

Software

• XTrackCAD
• TRAX Editor
• AnyRail
• Atlas Track Planning
• SCARM – Simple Computer Aided Railway Modeller
• TrainController
• Terragen Planet Design