Originally Posted by graywolf06
I looked at the video and it doesn't seem to pertain to the situation I am observing. According to Athearn my GP9 which was UP#216 had an EMD567 1st Gen Ver 1 Prime Mover. There was also a 567 Ver2 and a 567D Turbo PM used in other GP9's. The PM in my GP9 hardly changed sound when held back with my hand. Ver2 was much louder when held back. The Turbo version literally screamed when held back. I switched to the Ver2 PM as a compromise. So if anyone asks I will tell them that some rouge mechanics at UP changed the engine without informing management. I hope I don't get in trouble with the HO police.
Lol, cool then! Glad you worked it out. And you can always turn the volume down if it scares them too much..
But I love that feature!