It's not uncommon in winter for trains to kick up some snow...but dust? This is due to all the work being done by UP in the effort to construct the new main track (Main 2) between Tennyson Street and Pierce Street. The old Arvada Siding has been completely taken out and grading is now being done in preparation for the welded rail that will become Main 2. The new Arvada Siding is visible...buried in ballast, toward the bottom and right of the picture.
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