Like "161pw165" said, these are GP38-2s, not GP40s. 2000 HP vs. 3000 HP; Roots blower vs. turbocharger. They make look similar, but they're quite different and are designed for a different type of railroading.
I heard somewhere that P&W is doing contract repair work for GATX Locomotive Group. I know they did a paint job on a GATX locomotive; maybe that's why these units are there.
MEC407
Moderator:
Pan Am Railways — Boston & Maine/Maine Central — Delaware & Hudson
Central Maine & Quebec/Montreal, Maine & Atlantic/Bangor & Aroostook
Providence & Worcester — New England — GE Locomotives