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Perhaps I understand your post completely wrong, but... To call a SD70ACe a rebuilt SD90MAC seems a wide fetch to me. Different horsepower, different length, different traction motors, different engines (SD70: 2-stroke 710 with 4300 hp up to tier 3, SD90MAC: 4-stroke 256H with 6000 hp), a presumably different construction as crashworthiness requirements were tightened in the meantime. It was the GE ES44C4 that introduced an AC-locomotive with 4 AC traction motors and an A1A-A1A wheel arrengement to replace ES44DC locomotives in (intermodal) traffic were speed is more essential than traction effort at very low speed. All these locomotives have just one diesel prime mover. Currently the only roadswitchers offered by EMD and GE have 4300 hp and 4400 hp respectivly. And from 2015 on they to be certified according to EPA Tier 4. So there is not much choice. Knoxville locomotive Works offers a Tier 4 3200 hp locomotive. The SD70AH is a SD70ACe ballasted to the allowed axle load for better tractive effort. There are a number of Tier 4 switchers certified. If I got something wrong, correct me please. Regards, Volker
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