Climbing to Oblivion. The first morning departure of the Black Hills Central's "1880 Train" charges upgrade toward the summit just ahead which is known as "Oblivion." In its early years, the "1880 Train" was a narrow gauge operation, running on dual-gauged track and the 3rd rail only went as far as Oblivion, where a wye was built to turn the train. By 1964, the Black Hills Central was using standard gauge equipment and was able to go all the way from Hill City to Keystone. After that, the 3rd rail was lifted and the line has been standard gauge only ever since.