<page_title> List of United States commuter rail systems by ridership </page_title> <section_title> List of United States commuter rail systems by ridership </section_title> <table> <cell> 5 <col_header> Rank </col_header> </cell> <cell> SEPTA Regional Rail <col_header> System </col_header> </cell> </table>
SEPTA Regional Rail is the fifth commuter railroad in the United States.