Yeah, but we're talking millions of dollars per locomotive. I'm not trying to shoot down your idea -- it's not a bad idea! -- but it would likely cost almost as much as ordering a couple more MP36s from MPI. As it is, MPI gives railroads the option of reusing trucks and possibly even reusing frames, which is ultimately what you'd be doing, since almost everything else would have to be replaced (the long hood would need to either have some major modifications or outright replacement, since the 710ECO requires a much bigger radiator in order to meet EPA emissions standards).
MEC407
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Pan Am Railways — Boston & Maine/Maine Central — Delaware & Hudson
Central Maine & Quebec/Montreal, Maine & Atlantic/Bangor & Aroostook
Providence & Worcester — New England — GE Locomotives