The Association may, upon petition of any State, modify the final system plan to make further designations with respect to rail properties of railroads in reorganization in the region designated for transfer to the Corporation under such plan, if such designations (A) are likely to result in improved rail service on such rail properties and connecting rail properties, and (B) would not materially impair the profitability of the Corporation. Such designations, including designations of such rail properties to a State, a profitable railroad, or a responsible person, may be made at any time prior to delivery of the final system plan to the special court under
section 719(c) of this title. Such further designations shall be treated for all purposes as if they had been included in the final system plan adopted by the Association and reviewed by the Congress, and the final system plan shall for all purposes be deemed to be approved as modified by such designations. Any action of the Association with respect to any such petition shall not be subject to review by any court.