Tex. Transp. Code § 460.610

After any applicable capital recovery fee has been paid, the authority and the municipality shall negotiate to determine use of the amount of tax increment payments that exceeds the amount necessary to compensate the authority for the annual maintenance and operating expenses of providing service to the public transportation financing area. The excess amounts may be used to develop infrastructure enhancement, replacement, or improvement projects in the public transportation financing area that benefit both the municipality and the authority.