No terminable permit and no amendment to any existing license, grant, franchise, permit or consent incorporating therein the provisions of a terminable permit, shall become operative or effective until it shall have been approved by the commissioner of transportation. The commissioner of transportation shall have power to approve any such terminable permit or amendment, and, upon approval by him, every such terminable permit or amendment shall be valid and binding as between the parties thereto as of, from and on the day of the date of the execution thereof, in all respects and for all purposes therein expressed.
N.Y. R.R. Law § 173-G