Milepost Zero. This is the bottom end of the S&C Sub, and today work train D059 is parked on one of the sidings in Rockwood. In the not too distant past the B36-7 which is now relegated to ditching duty, used to haul the priority pig trains over the Keystone Sub, just behind the photographer. CSXT 5850, nee SBD 5850, Built 5/85, Builder Number 44853, Batch Number 1405-36.