Hi Stelios:
I must admit that the whistle in these videos seems similar to Ben's whistle and, from what I remember, somewhat like mine. However, I do hear a difference between the whistle Ben sounded when the Comet was coming (slowly) toward the camera device and later as it passes even with the camera.
I think both of these videos have most of the qualities I remember in my version, so I don't think I have something different from everyone else. Primarily, I think that the whistle seems to sound more "horn-like," but I detect some musical quality to it that suggests more of a low, breathy whistle (I think of my Big Boy whistle) rather than than higher, shrill whistle (I think of my Mikado or Hudson). [When I get back to my layout, I will try honking my diesels and compare the sounds, hopefully with audio/video for the forum (I'm sure others will do this way before me).] I heard this musical quality in particular about 1 min into Ben's video, as the train was even and passing by the camera. Mike Reagan's video also demonstrated some of the musical parts, with, admittedly, more of a "diesel-honk" quality during some of the sounds than many would have liked.
That being said, I am not as well-versed in railroad history or have anything other than very recent experience in the hobby. But, Ben, I promise that I will do some recording of my Blue Comet; I owe the forum some video of my VL Hudson at the very least. Look for me in about 3 weeks...
Regards to all,
Bruce