Intriguing. I'm guessing it operates as a boosting unit starting the train and up grades and adds dynamic braking going down grades. Unless it can charge off the diesel units or act as a slug at other times.
It seems like a logical evolution of the Green Goat switchers from about 10 years ago that were built from GP7/9 donors using batteries for power and having an on-board small diesel generator to charge the batteries when standing by.
