Seems like just yesterday the SD70ACe first came out. Hard to believe it has in fact been ten years now! This unit is actually considered an SD70AH by Union Pacific. It is virtually identical to an SD70ACe, except that it is heavier. Roughly 7,000 pounds heavier (427,000lbs vs 420,000lbs). While that may not seem like much, the extra weight does actually make a difference in tractive effort, allowing the unit to better grip the rails.
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