I should have said 11N's that I have been around. They have a very distinct sound. I can still hear them in my mind because they used several of them less than a a half mile from my house to stripmine one of my friends property about 22yrs ago.
This video has that sound I was describing. No whistle, only raw power fan noise track clunks and the occasional squeak of the blade twisting
https://www.youtube.com/watch?v=TDDFkHhWeGM
The coal company also was running some old worn out D10N's with the V12
They are louder than the 11's
Are you going to try to make it down to York,PA next weekend to display your dozer?