As UP 844 comes around the south leg of the wye at Speer Jct, a westbound Z-Train passes by on Main 3 in the background. UP 844 is slowly pulling the train through the wye and on to the Greeley Sub. Once the entire train is on the Greeley Sub on the single main, a pair of diesel engines on the back of the train will pull the train on the track in the foreground, back to Cheyenne.
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