That engine number is perfect for the job!! Was it coincidence, or intentional?
Coincidence. New Haven GP-9s were all numbered in the 1200 series. Don’t know if there was a 1225, but USA Trains picked 1224 for their model.
Looks like there there was a 1225 (the number series was 1200-1229). It survives today as Southwestern Pennsylvania RR 2003 (Now a GP11).