Along with being nostalgic for Schoolhouse Rock tunes, Hall and Oates singles and Too Close for Comfort reruns, the paunchy, balding, Doc Martens-wearing Generation X looks back fondly on childhood's summer days at theme parks. As a testament to this, Union Station (30 West Pershing, 816-460-2020) presents Project 31, an exhibit of five miniature replicas of Worlds of Fun roller coasters that dominated the park's profile 31 years ago. Many Kansas Citians first experienced free fall in 1980, aboard the Orient Express, the Screamroller, the Schussboomer, the Zambezi Zinger and (for the diaper babies) the Silly Serpent, and these working replicas should help you recall every drop, twist, loop and (in the case of the Zambezi Zinger) sudden cervical-vertebrae-straining halt. The free exhibit includes historic photos and actual Worlds of Fun artifacts from an era when Steve Perry's mullet cascaded like the magnificent drop of the Viking Voyager flume ride. These small-scaled, hand-built replicas stay on display through August 11 in the midway, near the Science City entrance. For more information, see unionstation.org.