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Todd, I read Typan's post and I disagree. However, I may be wrong. What I was told by a UP engineer (again I work for BNSF so I may be wrong) is that the SD90-43 is a 4300 hp unit. The SD90 is a 6000 hp unit. I am almost sure that both units are AC, (the AC in MAC means an AC unit, as opposed to SD70M, SD75M, GP60M all DC). Hope this helps.
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