That would depend on the terms of the agreement that the B&M made with P&W way back when. Who knows what it restricts or allows. As I've noted before, I understand that there is a power line pole encroachment problem somewhere in that stretch too. Whatever the agreements/easements are with the utilities would also be relevant.
When this csx thing first was announced i thought it likely CSX would move to try to restore the 2d track. However, since they went through the huge effort of getting P&W's agreement to the deal in the STB project, I've come to believe that putting in a 2d track is not all that easy--or at least is harder than just working with P&W on the existing track. Moreover, P&W runs at most 2 trains a day over that 3 mile segment. So it is not crowded even if the NS pair comes online, which would amount to 6 daily trains plus perhaps an occasional coal or grain unit train. And G&W is presently not hostile as far as I can tell. So I think CSX uses its capital to make capacity improvements elsewhere for the foreseeable future.
When this csx thing first was announced i thought it likely CSX would move to try to restore the 2d track. However, since they went through the huge effort of getting P&W's agreement to the deal in the STB project, I've come to believe that putting in a 2d track is not all that easy--or at least is harder than just working with P&W on the existing track. Moreover, P&W runs at most 2 trains a day over that 3 mile segment. So it is not crowded even if the NS pair comes online, which would amount to 6 daily trains plus perhaps an occasional coal or grain unit train. And G&W is presently not hostile as far as I can tell. So I think CSX uses its capital to make capacity improvements elsewhere for the foreseeable future.