Found a few sites for this---The two sound files in the Soundbug are a generic steam and a GP38-2. If you want a 710 turbo, such as actually is in the SD70, you'll have to buy the programmer. I did this research when I got a stealth BLI C30-7, and wanted to put sound in it.
OK--found one site--http://www.mdmlocomotiveworks.com/PAGES/Sounds.htm
Another one if you are thinking of recording it yourself--http://www.qsisolutions.com/products/techinfo/record-sounds.html
If you are really serious about going abouts recording your own--check this site out--
Some other ones are listed here as well--
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