Thanks to everyone for all of the replies. My wife and I enjoyed our relaxing rail trip along the Toccoa River in Northeast Georgia. Our car attendant was especially engaging and informative.
For any future Blue Ridge Scenic Railway inquiries, I can confirm that AAR 30 (160.560) is currently being used for rail operations and MURS 5 (154.600) is being used by the car attendants and concession staff. The attendants' radios I saw were all Motorola's and appeared to be fairly new.