UP 4141 was delivered as UP 8423 in 2005, and initially placed into service in primer paint, similar to the six heritage units before they were unveiled in their respective paint schemes. On October 18, 2005, the locomotive was officially unveiled at the George Bush Presidential Library; the road number 4141 was previously occupied by an SD70M, which has since been renumbered to 3778. The locomotive was displayed outside the Presidential Library for a while before it entered revenue service. Bush himself was allowed to operate the locomotive briefly. The unit was removed from active service in 2009 and placed in storage at UP's North Little Rock shop when traffic fell amid the financial crisis of 2007–2010. In 2012, the locomotive was removed from storage just long enough for a single round trip from North Little Rock to Chicago, then returned to storage. For a while, it was wrapped for long-term storage, but the wrapping was later removed. After Bush died on November 30, 2018, UP 4141 was brought out of storage and was sent to Houston, Texas, on December 1, 2018. The locomotive participated in Bush's funeral train on December 6, running from Spring to College Station, Texas. After the funeral, the unit was sent to Omaha, Nebraska, where it was displayed from December 9 to 12. UP 4141 later went on a system-wide tour, with stops in Chicago, Fort Worth, Houston, Kansas City, Los Angeles, North Platte, Pine Bluff, North Little Rock, Ogden, Portland, Roseville, and St. Louis. Following the tour, it returned to active service, in addition to being on display in other locations. On November 8, 2019, Union Pacific donated the 4141 to the George Bush Presidential Library, where it will be on permanent display in the pavilion. The locomotive made its last run from November 8 to November 9, traveling from Houston to Palestine, Texas as part of the Southwest tour of the recently-restored Big Boy No. 4014. Following its last run, it was taken back to the North Little Rock shops, where it will be prepped for display. The George and Barbara Bush Foundation hopes to have the 4141 exhibit opened by 2020.
