Looks like the ARRO train. And back when UP still had the cantilever mounted signals on the hill. Interesting that they were painted in a maintenance of way shade of green, much like a lot of signals on the WP at the time. Also interesting the switches on No.2 track from which the ARRO is diverging and from No.3 track are equilaterals. A great shot from the era of the SD40s, Charles.
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