Gadsden Pacific Division Toy Train Operating Museum - Tucson, ArizonaThere are 90 members of this organization dedicated to the advancement of model railroading by the collection and operation of toy trains and railroad memorabilia, as well as preserving prototype railroad history by sponsoring railroading related activities and events to share with the public. O-Gauge, G-Scale, Standard Gauge, S-Gauge, HO-Scale, N-Scale, Z-Scale displays are all set up for the showing of the different styles of model trains at the museum.  GPD hosts two toy train shows/swap meets annually, now called the Winter Toy Train (formerly Coyote) and Summer Toy Train (formerly Roadrunner) Shows.