has run hundreds of thousands of miles as Union Pacific's publicity locomotive. The locomotive often pulled the annual Denver Post-sponsored Cheyenne Frontier Days train that ran round-trip from Cheyenne to Denver every July before it was discontinued in early 2019. It appeared at Expo '74 in Spokane, Washington; the 1978 dedication of the Utah State Railroad Museum in Ogden, Utah; the 1984 World's Fair in New Orleans; and the 50th anniversary celebration of Los Angeles Union Passenger Terminal in 1989, when it performed a side-by-side run with Southern Pacific 4449. On February 14, 1975, it pulled Amtrak's San Francisco Zephyr from Denver, Colorado to Cheyenne, Wyoming with a pair of EMD SDP40Fs. In 1981, it traveled to the opening of the California State Railroad Museum in Sacramento, along with Union Pacific 3985, which had recently been restored to operational condition. Over the weekend of October 14, 1990, No. 844 led a procession of special trains from Kansas City Union Station to Abilene, Kansas for World War II veterans to celebrate the 100th birthday of U.S. President Dwight D. Eisenhower. The "Eisenhower Centennial Special" was composed of cars from the Union Pacific, Burlington Northern and Santa Fe Railway business fleets, with additional passenger cars provided by the Norfolk Southern and Chicago and North Western railroads. Also present in Abilene was General Eisenhower's command train, code-named "Bayonet", including the British A4 steam locomotive No. 60008 and communication and staff cars from WWII's European Theater of Operations. After the end of the 1991 excursion season, 844 was put in the shop for a major running gear overhaul in addition to other repairs. During that time, 844 was repainted from the passenger greyhound scheme to the freight black. It emerged from the shop in 1996. On June 21, 1997, on the way to the National Railway Historical Society (NRHS)'s annual convention in Salt Lake City, Utah, 844 and Union Pacific's Executive E units pulled 18 passenger cars on the Union Pacific's soon-to-close Tennessee Pass line, which included tracks on a narrow canyon shelf along the Arkansas River. On June 24, 1999, while on display during RailFair '99, one of the 844's boiler tubes failed, and the locomotive was subsequently towed dead back to Cheyenne by the recently overhauled No. 3985. The tube was found to have been made of the wrong material during the overhaul in 1996, a discovery that prompted the replacement of