Model Railroad Societies and Clubs
Amateur Model Railroading Society
Baltimore Society of Model Engineers
Frederick County Society of Model Engineers
Rensselaer Model Railroad Society
Rockville Model Railroad Society
Toy Train Operating Society
Annetta Valley & Western Railroad
Chesapeake & Allegheny Live Steamers
Lower Anthracite Model Railroad Club
Maricopa Live Steamers
Oaks Model Railroad Club
Penn State Model Railroad Club
The PennWestern Model Railroad Club
The Strasburg Model Railroad Club
Severna Park Model Railroad Club
The Sipping & Switching Society
Southwestern Live Steamers
Tex-N Modular Railroad Club
Valley N-Trak of Connecticut
Private Road Name Modelers Special Interest Group
National Model Railroad Association

Model Railroad Suppliers
Aristo-Craft
Athearn
Atlas
Colorado Model Structures
Digitrax, Inc.
InterMountain
Kadee
Kato U.S.A.
LGB Online
Lionel
Model Rectifier Corporation
Stewart
Testors
USA Trains
Walthers

Hobby Shops
Caboose Hobbies
Catoctin Mountain Trains
Cold Spring Hobbies
Cranberry Hobby Depot
eHobbies
The Global Outlet
Jim's Train Shop
Mainline Hobby Supply
Watts' Train Shop