70 ILCS 3615/2.17
The Authority may establish and maintain systems of pensions and retirement benefits for such officers and employees of the Authority as may be designated or described by ordinance of the Authority; may fix the classifications therein; may take such steps as may be necessary to provide that persons eligible for admission to such pension systems as officers and employees of the Authority or of any transportation agency whose operations are financed in whole or in part by the Authority, shall retain eligibility for admission to or continued coverage and participation under Title II of the federal Social Security Act, as amended, and the related provisions of the Federal Insurance Contributions Act, as amended, or the federal Railroad Retirement Act, as amended, and the related provisions of the Railroad Retirement Tax Act, as amended, as the case may be; and may provide in connection with such pension systems, a system of benefits payable to the beneficiaries and dependents of any participant in such pension systems after the death of such participant (whether accidental or otherwise, whether occurring in the actual performance of duty or otherwise, or both) subject to such exceptions, conditions, restrictions and classifications as may be provided by ordinance of the Authority. Such pension systems shall be financed or funded by such means and in such manner as may be determined by the Authority to be economically feasible.
70 ILCS 3615/2.17