With every viewing, the range of artworks keeps surprising me in “Transcontinental: People, Place, Impact,” the new Rio Gallery exhibition. By range, I’m referring to such contrasts as the printed stories and creative railroad interactivity of Stefanie Dykes and Amie Tullius’ well-travelled “Train Tracts,” paired with Gregg Deal’s “The Divinity of Inanimate Objects Omit their Sins,” a vivid collage painting …