CASPER, Wyo. — A key piece of Casper’s industrial history will be returning in the coming months, as the historical Standard Oil No. 1 steam locomotive is being moved from a Colorado museum to the local Fort Caspar Museum. Built in 1920, the locomotive was used at the Standard Oil refinery in Casper, serving as the facility’s sole switcher, local historian and Fort Caspar Museum volunteer Con Trumbull said. As a switching locomotive, its primary…