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I've seen a couple models of Amtrak Dash-9's, but I have never actually seen a real one. I had expected to see one or two on my trip to Essex Montana, but the Empire Builder as headed by 3-4 Genesis locos. Where does Amtrak run its Dash-9's?
THey aren't actually "Dash 9's". They are P32-8B. The differences are these: 1) They have 3200 horsepower (versus the 4400 of a Dash 9), They have only have 2-axle trucks (versus the 6 axles on a Dash 9). They're also shorter, have a smaller fuel tank, and have HEP (Head end power).
As for where they run - The ones I've seen were all on the Coast Starlight between Seattle & Los Angeles. A couple got sold to Amtrak California, and I've seen one or two on the Amtrak Cascades Talgo trains.
MP42PH...! Only problem with the MPXpress units is they're too tall. Remember the reasoning behind the short squat AMD-103 (P40/P42) is so that it clears all Amtrak routes.