Just found this news tidbit on the UP website. Check out the radiator fan/dynamic fan arrangement. Funky! You California fellers get busy and snap some photos for us!!!
9900 appears to be the only SD59MX modified like that. There are about a half dozen based in Roseville that I see regularly and they are not like the lead unit.
The other units look like a stock SD70M for the most part that was refurbished. I wonder what EMD will do after the 70Ace using this tech? Would be cool to see another GP again.