This is a small clip of a recording of D&RGW K-37 493 with a Norelco Microphone by Jack La Munyon and from the collection of the late Ernest Robart. Ernie who was a friend sent me a copy of the recording to put on a CD for him and would approve of sharing the NG history. This recording was made in 1967. 493 really had a distinctive whistle for sure. I also believe I've seen a video of 473 on the D&SNG in the late 80's or early 90's with a very similar sounding whistle, not sure if that came from the 493. The images in the video are from my personal collection. Enjoy!
William