Yeah, I saw it too! Today. For the first time.
According to the June 18, 2007 roster update at The Diesel Shop
It is on the roster!
It is a wreck (figuratively speaking). Took a close look at it and a few pics.
They've already did some disassembly ( hand rails on walkway, rear engineer side are removed).
Also of note are the "DO NOT OCCUPY CAB" signs on the cab door windows.
I wonder what their plans are? Not like an SD40 is a good parts source for the GP30 or their big 6-axle GE's.