The Union Pacific Railroad Complex in Evanston, Wyoming, was built to serve the Union Pacific Railroad main line running through Evanston. The complex's brick buildings were built in 1912–13, with frame buildings spanning the period from 1871 to the 1920s. The complex features a roundhouse with 27 stalls built during the 1912 improvement phase, replacing an earlier roundhouse built in 1871. The complex was the chief service point on the UP main line between Ogden, Utah, and Green River, Wyoming.