Notwithstanding any other provision of this chapter, no acquisition under this chapter shall be made by any profitable railroad operating in the region without a determination with respect to each such transaction and all such transactions cumulatively (A) by the Association, upon adoption and release of the preliminary system plan, that such acquisition or acquisitions will not materially impair the profitability of any other profitable railroad operating in the region or of the Corporation, and (B) by the Commission, which shall be made within 90 days after adoption and release by the Association of the preliminary system plan, that such acquisition or acquisitions will be in full accord and comply with the provisions and standards of subchapter III
1 of chapter 113 of title 49. All determinations made by the Association in the correction to the preliminary system plan published on
April 11, 1975 (40 Fed. Reg. 16377), shall be treated for all purposes as if they had been made upon adoption and release by the Association of the preliminary system plan. All determinations made by the Commission with respect to such correction shall be treated for all purposes as if they had been made within 90 days after adoption and release by the Association of the preliminary system plan. All determinations made by the Commission with respect to acquisitions by profitable railroads referred to in any supplement to the preliminary system plan published under
section 717(b)(2) of this title shall be deemed to be timely if made prior to the adoption of the final system plan under
section 717(c) of this title. The determination by the Association shall not be reviewable in any court. The determination by the Commission shall not be reviewable in any court.