Here's a site I found, not sure how good it is. Don't know why the serial's not working, you should contact the company probably.
http://trainz.luvr.net/downloads-inside.php
http://web.ibertrainz.com/secciones/rodante.html
To find more, just try using yahoo or google and see. Some sites do payware addons but have locos with great sound for free, got a few of those... just look around....question is, if you're not a serious train fan then what's the point - it's the routes that are interesting, and I don't know of any that are self contained. But then, I am and shall remain a trainz noob. Best thing would probably be to join a forum and ask questions...
Happy chuffing
Krigl


