A true O scale model of the SOO LINE FP7 locos have not been offered in either original or new SOO schemes.
Both MTH and Lionel could make GP30 diesel-electric locomotives in China. Neither has produced the SOO LINE GP30s. The problem could be the ALCo FA sideframes on the real GP30s.
Atlas O produced a small run of SOO LINE GP35 locos several years ago, so the people at Lionel and MTH are still holding off on making the GP35s in the SOO LINE scheme, for some reason.
The people at MTH did have the SOO LINE GP40 produced with ProtoSounds 2 and ProtoSounds 3 in China.
There are many more railroad paint schemes to produce using existing models.
Andrew