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Why did UP choose the 70 macs
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Evan, just a note about the EPA emissions, there are currently a number of 70M's running around (i don't know where in the # sequence they start) that are already tier 1 certified. while they do have a special govenor, it is still a mechanical/hydralic govenor, and all they have is different, but not electronic, fuel injectors. in the computer at work, any of these that are tier 1 approved have a list of about 4-5 things that have been changed and if replaced, must be replaced with like parts. I have seen some of the lower #'d 70's with the same listing, so they must be retrofitting the older ones as they come in for shopping. Also, I've noticed the true 90's are creeping back into intermodal service, albeit not as leaders, but as the middle unit of a three unit "power set", typically with a 70 on each end. Also the GE 7500's are back in intermodal service, as they too, had many teething problems out of the gate, so perhaps it's just a matter of time before they both get back to their intended service, (although hopefully with enough extra power if you loose one you don't "lay down").
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