As UP 8837 comes up to "The Sag" on Main 1, it passes by BNSF's protection unit. BNSF only has four units on their coal trains there here, set up 2x0x2. That is the bare minimum for a 120-car coal train going over Palmer Divide. In the event that one of the four units fails, BNSF keeps this unit here for easy retrieval to rescue any such stalled coal load. Before they started keeping a unit here, they had to call one out of Denver, or steal one off of another train.
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