1. Short title This Act may be cited as the Resilient Transit Act of 2023 . 2. Definitions Section 5302 of title 49, United States Code, is amended— (1) by redesignating paragraphs (17) through (25) as paragraphs (18) through (26), respectively; and (2) by inserting after paragraph (16) the following: (17) Resilience improvement The term resilience improvement has the meaning given the term in section 176(a) of title 23. . 3. State of good repair grants for public transportation resilience improvement (a) In general Section 5337 of title 49, United States Code, is amended by adding at the end the following: (g) Public transportation resilience improvement grants (1) Definitions In this section: (A) Environmental justice community The term environmental justice community means a community with significant representation of communities of color, low-income communities, or Tribal and indigenous communities, that experiences or is at risk of experiencing higher or more adverse human health or environmental effects. (B) EJSCREEN The term EJSCREEN means the environmental justice mapping and screening tool created by the Environmental Protection Agency. (C) EJ Index The term EJ Index means the Environmental Justice Indexes in EJSCREEN. (D) Medically underserved community The term medically underserved community has the meaning given the term in section 799B of the Public Health Service Act ( 42 U.S.C. 295p ). (E) Underserved community The term underserved community means— (i) a community located within a ZIP Code or census tract that is identified by the Secretary as— (I) a low-income community; (II) a community of color; or (III) a Tribal community