The CSX former ACL main through Rocky Mount...Charleston...etc...is a track and 1/2 CTC format..alternating between single and double. Not unlike the Southern Main. This line is a traffic jam for CSX. Just look how slammed the former RF&P segment is...this is essentially an extension of the A-Line. So if all the western roads can add double and tripple track..digging through canyons etc. Why can't CSX simply use the empty "ready to go space" and put that second track back?
Even most of the former C&O is double...and its not as busy.