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[quote]QUOTE: Originally posted by Paul Milenkovic AC vs DC Diesels: .... The interesting thing about the SD70M(DC) is that UP wanted to replace their large fleet of SD40s in kind instead committing to the novel AC technology. While the SD70M has all of the limitations and maintenance requirements of the DC traction motor, it is a known quantity while the AC locomotive might have some not-yet-known problems. [/quote] The main problem against a AC locomotive: Costs !!!! A new AC locomotive will cost something between 500.000 and 1 Million $ more than the same engine in DC. (AC4400CW against Dash9-44 CW). An d this is real money!!! When a RR need engines for fast intermodalservice a "simple" DC is a very good option against an AC! So the RR´s buy not longer universal engines like the SD40-2, they order exact that engine what they need. UP for example buyed a large fleet of SD70M for intermodals, manifests and such trains. For the heavy coal trains they ordered a large fleet of AC4400CW and some SD90MAC and AC6000CW. BNSF does the same with Dash9-44CW and SD70MAC (since 2003 also AC4400)
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