Union Pacific’s Steam Locomotive No. 844 is traveling 13,000 miles through 15 states as part of Union Pacific's 150th anniversary celebration. Steam Locomotive No. 844 is the last steam locomotive built for Union Pacific Railroad. It was delivered in 1944.The engine has run hundreds of thousands of miles as Union Pacific's ambassador of goodwill. It was 150 years ago that Abraham Lincoln signed the Pacific Railway Act of July 1, 1862.These photos were taken in Denton, Texas when the train made a 30 minute stop to have the locomotive's giant wheels serviced. It then left for Ft Worth.