Power on CORP

[YoHo1975]

So the Medford Or news paper reported that CORP ran some test trains over the Siskiyous summit using engines that would reduce fuel consumption and possibly rates. If it works out, they're looking to re institute regular service at apparently shipper acceptable rates. What I can't find is any information on what new motive power CORP tried? ECOs? Gensets? simply something more modern than 2nd gen EMD? Slugs? Anyone know?

[YoHo1975]

I'll answer my own question. It was the GP20Ds that came on property about a month ago.