The locomotive operated in revenue service until 1959. It was initially placed into storage while awaiting withdrawal, along with the rest of the Union Pacific steam locomotive fleet. In 1960, railroad leaders recognized the benefits of having a steam program and retained No. 844 for special activities, the kernel of what has become the Union Pacific's heritage fleet. Today, it is one of UP's oldest serving locomotives and the only steam locomotive owned by a North American Class I railroad that has never been retired.