70 ILCS 3605/6

Subject to the powers and duties of the Northern Illinois Transit Authority created by the Northern Illinois Transit Authority Act, the Chicago Transit Authority shall have power to acquire, construct, own, operate and maintain for public service a transportation system in the metropolitan area of Cook County and outside thereof to the extent herein provided and all the powers necessary or convenient to accomplish the purposes of this Act, including, without limiting the generality of the foregoing, the specific powers enumerated herein.