For southbounds, Littleton marks the location where CTC (and three main tracks) is left behind in favor of TWC/ABS (and only two main tracks). While southbounds may find themselves on any of the three tracks leading up to Littleton, south of Littleton they nearly always find themselves on Main 1. Such is the case here as a pair of GEs lead a BNSF manifest south on Main 1.
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