Well; in terms of things I personally have been hoping for; Railking 30 item number series GP7 in NKP livery and a PRR GP9. Will note here that I prefer the 30 series over 20 series Railking engines as they seem to perform better on my layout for whatever reason.
I finally decided to take matters into my own hands insofar as the NKP GP7 is concerned and am having a 30 series PS3 Railking GP7 custom painted for NKP. Push comes to shove; I may do the same to get a 30 series Railking PRR GP9.
Curt