70 ILCS 3605/2
When used in this Act:
"Transportation System" means all plants, equipment, property and rights useful for transportation of passengers for hire except taxicabs and includes, without limiting the generality of the foregoing, street railways, elevated railroads, subways and underground railroads, motor vehicles, trolley buses, motor buses and any combination thereof.
"Metropolitan area of Cook County" embraces all the territory in the County of Cook, State of Illinois East of the east line of Range Eleven (11), East of the Third Principal Meridian of the United States Government survey.
"Metropolitan area" means the metropolitan area of Cook County, as above defined.
"Authority" means Chicago Transit Authority created by this Act.
"Board" means Chicago Transit Board.
"Governor" means Governor of the State of Illinois.
"Mayor" means Mayor of the City of Chicago.
"Motor vehicle" means every vehicle which is self-propelled or which is propelled by electric power obtained from overhead trolley wires but not operated on rails.
"Municipal government" means a "municipality" as defined in Section 1 of Article VII of the Illinois Constitution.
"Unit of local government" has the meaning ascribed to it in Section 1 of Article VII of the Illinois Constitution.
70 ILCS 3605/2