CSX Transportation's Valrico Subdivision is a railroad line in Central Florida. It serves as CSX's main route through a region of Central Florida known as the Bone Valley, which contains the largest known deposits of phosphate in the United States. The Valrico Subdivision runs from a junction with CSX's S Line in Valrico east to Mulberry and Bartow before turning south to Fort Meade and Bowling Green for a total of 47 miles.