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I will be covering this portion of the Union Pacific from west to east since most of my trips across the territory were made in that direction. From the time the railroad connected with the Central Pacific to the end of the century, the UP was only able to add about 17 miles of second track. Early semaphore signals were installed between 1906 and 1917. These were replaced with searchlight signals in the late 40s.
With increased traffic and the leadership of Harriman the railroad transformed the single track Overland Route to mostly double track by the end of 1918. UP added a second track between Ogden and Devil's Gate in 1916 and then Emory to Wahsatch in 1917. Double tracking was completed from Ogden to Green River in 1926. The original mainline through Weber Canyon was 1.72 percent. The newer track was added on a slightly different alignment and was only 1.14 percent. The new track became the eastbound line and the original mainline was then used for westbound trains. In 1974, the Union Pacific installed CTC from Ogden 20 miles east to Strawberry.
Salt Lake City