Tenn. Code Ann. § 7-56-103

Any such municipality, county, or combination of municipality and county, or a transit authority created by it, has the right to make any and all agreements with or applications to any person, firm, federal or state agency, municipality, or public or private corporation, relating to the acquisition, construction, maintenance and operation of all or any part of a public transportation system, and contracts for loans, grants or other financial assistance from any state or federal agency. Such municipality, county, or combination of municipality and county, or a transit authority created by it, is expressly granted the right to contract with any person, partnership or corporation, to manage and operate the transit system and to employ the necessary personnel under the direction and supervision of the municipality, county, or combination of municipality and county, or a transit authority created by it. Any such contracts made by the municipality, county, or combination of municipality and county, or a transit authority created by it, shall be entered into and executed in such manner as may be prescribed by the charter of the municipality, or the general laws of the state.