I was doing a run from Boston South to Stoughton, and when I started the F40PH, I noticed that one crucial element wasn't present: the sound. Just the roar of the engine was missing, the track joint sounds were all there though. This video I've quickly made describes the scene miles better than what I can. Just take a look:
Probably not, as I got on that train after completing another service, spawning on foot rather than a timetable service... That's probably the bug. Also this is the first time I'm witnessing this event. Still, wonderful route though!
I also noticed the same thing when I was spotting at Boston, the engine was kicking smoke out but it was totally silent.