BiknJ from Orange Park, FL on 2/14/2021 12:27:53 AM:
No, you are not riding on 278. There is trail in this area. But it isn't on the railroad bed. I think that part is still used by trains. A couple of miles after leaving Rockmart the trail runs parallel to 278 for about three miles, but it is well separated from the highway. It turns south away from the highway and sometimes parallels the railroad, crossing it several times. Here’s my map I prepared before our ride. https://ridewithgps.com/routes/26398845
YES it is hilly—hillier than 278. It was a bit much for me, but I’m well into my 70s.