The Dayton Train Show is a model-railroading expo held at the Montgomery County Fairgrounds in Dayton, Ohio, that brings together club layouts, vendor tables, and exhibits celebrating model trains and railroad history. The event features operating layouts, manufacturer and hobbyist displays, and activities that appeal to collectors, families, and rail enthusiasts from the Dayton area and beyond. It serves as a regional gathering for people interested in model construction, scenery, and operational demonstrations.