This coal load is sitting stopped at an Approach (yellow) signal at MP 50.5 on Main 1. The dispatcher has some northbound trains aligned through the single track and on to Main 2 ahead at Palmer Lake. Coal trains will often sit at this signal when they know they cannot proceed beyond Palmer Lake. The train is straddling "the sag", which allows the traction motors on the units to cool after the long and hard climb up from Denver.
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