I was stating "why does it matter" meaning my question, in case anyone wondered why I would ask that. I suspect they will be a big difference from a technical standpoint, fuel and , I am guessing noise.They won't be in service this year. If they are, I doubt it'll be those routes.
What does it matter? Well truly, it doesn't make much of a difference to the regular traveler. However to railfans, it makes a lot of difference. It will simply be sad to see the P42's (current engines) be replaced, as we've all gotten used to seeing them haul our trains over the years.
I am excited, but sad I won't get to ride behind one this fall.......... Thanks Cal1