I am grateful to Josh at Empirical Polk for his embellishment of my post on the CSX main lines that cross only in Polk County. I think Josh is entirely correct that the crossing I first cited is not the big crossing. Instead, and I’m waiting on CSX to confirm this, I think it actually happens dead in the heart of Lakeland, just off Lake Wire, not half-a-mile from where I work in downtown. - Polk County News Blog