What is a C-90-AC?

opus722

Electric Love!
On NS Employee Time Tables there is a list of locomotives sorted by group depending on how they are rated for tonnage. They're all pretty straight foward, but there is a reference to a "C-90-AC" that I am not familiar with and I can't turn up anything on Google about it other than things referencing back to an NS ETT. It's grouped with other GE AC units and it is not a different name for the SD90MAC as that is listed as a separate entry. So what is it?
 
I don't think so. It's in several time tables across different divisions from different years. If it is a typo, then NS needs to fire their proofreader. Also, pretty much every modern locomotive is already accounted for in them. The other GE AC units listed, AC4400CW and AC6000CW, are labeled in a similar fashion as C-44-AC and C-60-AC respectively.
 
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