In order for the Cheyenne Frontier Days train to make the return trip from Cheyenne to Denver, the train has to be wyed (turned around). The nearest wye to Cheyenne is over six miles away at Speer Jct. UP 844 making that reverse move would take hours! So, UP has a better solution. A pair of engines simply hook on to the tail end of the train and pull it to Speer Jct. By doing this, there are no speed restrictions. Here, a pair of units pulls the train on Main 4 toward the first leg of the wye at CP W517.
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