For some time now, my friend  LuniqueKero has been making animated YCH stickers for use on various platforms. On one of the stickers (https://www.furaffinity.net/view/59379331), I commented that a train whistle sound effect could be appropriate.

With Kero's permission, I experimented a little and added some effects. You can see the animation here:

https://drive.google.com/file/d/1nh.....ew?usp=sharing

Note: You may get better playback results if you download the file first.

Comments are welcome. I encourage you to check out Kero's stickers and inquire about commissioning some!