@Shawn Chronister
I do not know what the specific KCS E6 livery is that you wanted & that 3rd Rail had advertised in their original ad.
Is there any chance that you can modify it yourself like Rob Leese did for his CB&Q E5A ?
I empathize with your disappointment about the livery change with no update from the 3rd Rail team.
Sunset / 3rd Rail makes great models. However, they sometimes get ahead of their skis & neglect customer communication regarding changes.
CB&Q Bill