The Krellnut's Wagon Sound Pack of RWA Library requires both manual installing (copy & paste operations) of wagons sounds and then manual installing of level of sounds (there are 4 levels named steps). Also requires previous backup of original files in case of problems or if user wants to revert to default sounds.
The Krellnut's Wagon Sound Pack hosted on Trains and Drivers (with license of author) is the same mod sound asset but has a pack easier to use:
a) automatic install with RWTools feature with 3 clicks of mouse, no manual copy nor previous backup. However it will install only the level considered by Krellnut as closer to the real, according to his expericence when recording the sounds.
b) automatic "restore to default" de-install pack (using also RWTools feature).
The current and direct link is
http://freeware.trains-and-drivers.com/ and (I guess) don't need to sign in, just go there and download.

Who doesn't have dog, hunts with cat.