Except with respect to abandonment under section 1170 of this title, or merger, modification of the financial structure of the debtor, or issuance or sale of securities under a plan, the trustee and the debtor are subject to the provisions of subtitle IV of title 49 that are applicable to railroads, and the trustee is subject to orders of any Federal, State, or local regulatory body to the same extent as the debtor would be if a petition commencing the case under this chapter had not been filed, but—

(1) any such order that would require the expenditure, or the incurring of an obligation for the expenditure, of money from the estate is not effective unless approved by the court; and

(2) the provisions of this chapter are subject to section 601(b) of the Regional Rail Reorganization Act of 1973.