Fair and equitable arrangements shall be provided, in accordance with this section, to protect the interests of any employees not otherwise protected under title V of the Regional Rail Reorganization Act of 1973 (
45 U.S.C.
771 et seq.), who may be affected by actions taken pursuant to authorizations or approval obtained under this subchapter. Such arrangements shall be determined by the execution of an agreement between the representatives of the railroads and the representatives of their employees, within 120 days after February 5, 1976. In the absence of such an executed agreement, the Secretary of Labor shall prescribe the applicable protective arrangements, within 150 days after February 5, 1976.