yea so the sd70ace has 2 horns btw there random spawn but i was on Sherman hill and i found out the horn was a low pitch k5lla but when i restarted the service i got a high pitch k5lla on both routes thats good detail btw i just wanted to point this out
Nope, DTG usually only keeps these new features for newer content, and dont want to spend the time updating older stuff without any ROI.
I think I do remember them saying something about this when they first launched and like you say they are randomly picked each time you drive a loco.