The Borie Cutoff is a (roughly) 3 1/2 mile long stretch of single track that connects Main 1 and 2 of UP's Overland Route with Main 3 and the Greeley Sub at Speer Jct. This allows trains that were on the Overland but are headed for Denver, such as this Z-Train, to head straight for Speer for their crew change from Mains 1 and 2. If you look in the distance, the bridge you see actually crosses over Mains 1 and 2.
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