; and port infrastructure investments (including inland port infrastructure and land ports of entry): Provided further , That of the amount made available under this heading, the Secretary shall use $15,000,000 (increased by $5,000,000) for the planning, preparation or design of projects eligible for funding under this heading, with an emphasis on transit, transit oriented development, and multimodal projects: Provided further , That of the amount made available under this heading, the Secretary shall use $20,000,000 (increased by $5,000,000) (reduced by $5,000,000) for the planning, preparation or design of projects eligible for funding under this heading located in areas of persistent poverty: Provided further , That the term persistent poverty means any county that has had 20 percent or more of its population living in poverty over the past 30 years, as measured by the 1990 and 2000 decennial census and the most recent Small Area Income and Poverty Estimates, or any census tract with a poverty rate of at least 20 percent as measured by the 2013–2017 five-year data series available from the American Community Survey of the Census Bureau, or any territory or possession of the United States: Provided further , That grants awarded under the previous three provisos shall not be subject to a minimum grant size: Provided further , That the Secretary may use up to 20 percent of the funds made available under this heading for the purpose of paying the subsidy and administrative costs of projects eligible for Federal credit assistance under chapter 6 of title 23, United States Code, or sections 501 through 504 of the Railroad Revitalization and Regulatory Reform Act of 1976 ( Public Law 94–210 ), as amended, if the Secretary finds that such use of the funds would advance the purposes of this paragraph: Provided further , That in distributing funds provided under this heading, the Secretary shall take such measures so as to ensure an equitable geographic distribution of funds, an equitable distribution of funds between