Texas Local Government Code - LOC GOV'T § 615.023. Contracts with Transit Authorities

(a) The commissioners court of a county may contract with a rapid transit authority operating under Chapter 451, Transportation Code, or a metropolitan transportation authority operating under Chapter 452 of that code for the authority to provide public transportation services to an unincorporated area of the county outside the boundaries of the authority.

(b) The county may impose taxes and pledge and encumber other receipts and revenue as may be required to make payments to the authority under the contract.