The F59PHI was equipped with an EMD 12-cylinder turbocharged 710G3C-EC prime mover.
ESU has several 16-cyl 710G3 files, but no 12-cylinder file. I'd probably use one of the 16-cylinder versions (probably the Tier 2 version) until a 12-cylinder becomes available. Given the widespread use of the F59 in passenger service, got to believe recording one is on Matt Hermann's to do list.
John C.