Like most Class 1 railroads today, Union Pacific has a lot of older units in long term storage. Many of them, including dozens of SD70Ms, are currently stored at 36th Street Yard in Denver. The units are waiting for one of three things. To just be reactivated and put back in service, to be rebuilt and put back in service, or be sold. Until one of those three things happens, here they will sit quietly and wait.
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