In Clarkdale, Arizona, a train line offers a chance to experience beautiful landscapes and a vintage railroad experience all in one. The Mogollon Rim, made famous by numberless Westerns from Zane Grey onward, is a prominent escarpment that runs roughly east to west through much of central Arizona. It is the southern erosional edge of the Colorado Plateau, a large area of generally flat-lying strata that hosts many of the Southwest’s most iconic national parks. Along the Mogollon Rim itself, south-draining streams have locally carved deep canyons through the scarp,…