Closest, but not perfect for the application is the ALCO 251 ULT file. The PAs had the 244 engine, but there is no sound file for that, so you'll have to compromise with the 251. At least it's an Alco file!
Bonus - the 4 PAs that the D&H owned (ex Santa Fe) were rebuilt with 251s so, maybe you are modelling the D&H units.
As to horn, it depends on your prototype. They could have blat horns or 5 chime ones.