The 'S' Scale Model Railway Society
- 3/16" scale is somewhere between 4mm and Gauge 0, usually modelling to high standards. Provides choice of browser viewing modes on arrival.
- http://www.s-scale.org.uk/

Toy Train Operating Society
- Dedicated to the operating and collecting of trains of all makes and eras. Includes information about activities, a membership application, a directory of divisions, a calendar of events, and publications. Located in Pasadena, California, USA.
- http://www.ttos.org/

3mm - The Three-Millimetre Society
- Features its history, background to TT3 gauge, picture galleries and membership information.
- http://www.3mmsociety.org.uk/

Lionel Collectors Club of America (LCCA)
- An international club of electric toy train lovers, operators and collectors. Publishes The Lion Roars (news), Interchange Track (Buy-Sell-Trade); train meets, conventions, swapping events for fans of all ages.
- http://www.lionelcollectors.org/

N Gauge Society
- Promotes N Gauge Model Railways, supports the hobby and provides a forum for all N Gauge enthusiasts.
- http://ngaugesociety.com

Lionel Operating Train Society
- A large collection of articles, reviews, individual pieces, and photos, all dedicated to Lionel Trains.
- http://lots-trains.org

FREMO Freundeskreis Europäischer Modellbahner eV
- Modelrailroading on modules in several scales and from different prototypes. Information on implemention of DCC on really large layouts.
- http://www.fremo.org/inhalt_e.htm

Ridge Live Steamers
- Dedicated to the preservation of our railroad heritage. Photo gallery, information on group, location and facility, event calendar and membership.
- http://www.ridgeclub.org/

NTRAK Modular Railroading Society, Inc.
- Provides specifications and information about NTRAK modules, the most popular model railroading module type. NTRAK is for N scale (1:160). Includes links to NTRAK local and regional clubs.
- http://ntrak.org/

The 2mm Scale Association
- Information about 2mm Scale (1:152), predominantly scratch building. Information about the Association and membership rates. Articles, photographic albums, and links to other specialist 2mm sites. Some support for 1:160 finescale (FiNe) and Nn3/Nm.
- http://www.2mm.org.uk/

Chiltern Model Railway Association
- Founded in 1965 the Association, through its membership, aims to encourage and promote the model railway hobby in the UK.
- http://www.cmra.org.uk/index.html