UP's tracks west of Cheyenne offer an interesting configuration. Mains 1 and 2 head directly west toward Hermosa Tunnel and Laramie. Mains 3 and 4 curve south and run to Speer Jct. At Speer Jct, the Greeley Sub (toward Denver) breaks off and Mains 3 and 4 curve west. Then, the mains converge into a single main track. This track (Main 3) also runs to Hermosa, but as a single track on a completely different grade from Mains 1 and 2. The grade on Main 3 isn't nearly as steep as on Main 1 and 2, so heavy westbounds, such as the grain train in this shot, are frequently routed over Main 3 to Hermosa.
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