Explore the history of Superior and South superior, Wyoming. These small towns were established early in the 20th century, established by the Union Pacific Coal Company. South Superior was privately owned and as a result most of the commercial business in town was located there. When the Union Pacific Railroad began switching from steam power for its locomotives to diesel power, the market for coal disappeared. The classic western pattern for ghost town creation was set. But though Superior disappeared, South Superior, while badly hurt economically, survived. It took the Superior name and was able to look forward to a diminished but stable and hopeful future.