My thread on the MTH BR-44 brought up a discussion of whistle sounds. Frankly, it matters not at all to me if the whistle on a model loco is true to the prototype or not, but I like a good whistle sound. Below are short videos of two I really like, both from the MTH Euro series. I'd love to see/hear files of other model locos folks particularly like.
This is one of my favorite locos, the French 241.A "Chapelon." It's whistle is spectacular, the best I have, and this video does not really do justice to it. This loco is a jewel to look at, but sometimes I run it just to hear the whistle . . .
This is the new MTH BR-44. European, but far different. Still really cool. Another of my favorites.