SD3R
San Diego 3-Railers layout at the San Diego Model Railroad Museum, Balboa Park S.D. CA

SDMRM
San Diego Model Railroad Museum in Balboa Park, San Diego, California

TTOS-SP
Toy Train Operating Society - Southern Pacific Division

San Diego S-Gaugers
An "S" Gauge model train group located in San Diego, California

The Gilbert Gallery.org
A website dedicated to American Flyer S-Scale Model Trains

RailServe.com
RailServe.com is a leading provider of rail information services, including the world's largest and most popular online rail directory.