BNSF's daily trackage rights manifest, which runs from Denver, CO to Provo, UT, is making its way west on the Moffat. The train has just crossed Kipling Street (back at the red intermediate) and is approaching 72nd Avenue. Note the sign that says "X" and "QZ". The "X" indicates to the crew that a grade crossing is approaching. The "QZ" indicates that the crossing is a "Quiet Zone", and that the horn should not be used (unless somebody is actually on the tracks).
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