Tex. Transportation Code § 460.611

If the tax increment is pledged to the payment of bonds and interest on the bonds or to the payment of any other obligations, the public transportation financing area or an agreement for services under Section 460.602 may not be terminated by agreement of the parties unless the municipality that created the public transportation financing area deposits or causes to be deposited with a trustee or other escrow agent authorized by law funds in an amount that, together with the interest on the investment of the funds in direct obligations of the United States, will be sufficient to pay:

(1) the principal of, premium, if any, and interest on all bonds issued on behalf of the public transportation financing area at maturity or at the date fixed for redemption of the bonds; and

(2) any other amounts that may become due, including compensation due or to become due to the trustee or escrow agent, as well as to pay the principal of and interest on any other obligations incurred on behalf of the public transportation financing area.