Radio Frequencies
CSX
161.3700 (AAR 84) - Road Channel for Nashville, TN and surrounding area
161.1000 (AAR 66) - Dispatcher Channel for Nashville Terminal
Candian National
161.1900 (AAR 72) - Road Channel for Fulton, KY
Music City Star - Nashville & Eastern
161.0700 (AAR 64) - Main Operations Channel
Norfolk Southern
* I have yet to be able to pickup anything in NS territory!
Disclaimer
I will only post a channel if I have heard it personally, or have been given it by a reliable source in the railfan community.