Running pretty much right on time, the morning Zephyr has left Denver Union Station behind and is continuing its trip west toward California. The train is on UP's Main 2 between Prospect Jct and Fox Jct. Between those control points, a distance of about a mile, UP has two main tracks. You can just see Main 1 on the far right side of the shot. The yard tracks are BNSF and part of Rennicks (intermodal) yard.
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