From the Document: "Despite suggestions that ridership on the nation's public transportation systems is beginning to grow again, available evidence suggests this optimism is premature. According to data from the American Public Transportation Association (APTA), 2018 marked the fourth straight year of declining ridership, falling by about 2.5% from the year before. [...] Two major federal transit policies related to these issues are the general funding of public transportation, distributed mainly by formula, and the discretionary funding of new large capital projects such as rail and bus rapid transit systems through the Capital Investment Grants (CIG) Program, also known as New Starts. [...] Congress may consider options to address public transit ridership trends as it weighs reauthorization of federal surface transportation programs. The current authorization expires at the end of FY2020."
CRS Insight, IN11181
Congressional Research Service: https://crsreports.congress.gov/