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If you had seen them in action you would know that the DDA40X's were not a failure. UP kept them moving on high priority, high speed trains. They simply got worn out and it was less expensive to replace than repair. When you are able to get nearly 1000 miles a day out of your locomotives (like UP with the Centennials, and NYC with the Niagaras) it only takes 3 years to reach 1,000,000 miles. Of course there are inspections, class repairs and the like which reduce the average milage per day. But when a class of locomotives is kept in high milage service they don't last as many years as a lower milage locomotive. And since the DDA40X's were lousy yard switchers, couldn't handle the dock tracks in LA or industrial tracks in the cities, and were too heavy for many branches, the UP kept them busy on the service for which they were designed.
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