According to the website below this unit was only 10 years old at the time of the photograph - built close to the end of this model's production after which GE introduced the C30-7. Like many U30's it didn't last long being retired only 3 years later.
http://utahrails.net/up-diesel-roster/up-diesel-roster-loco-chron-03.php
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What are these exactly? Industrial storage tanks?
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