SEPTA Regional Rail is the commuter rail system serving Philadelphia, Pennsylvania and its metropolitan region, also known as the Delaware Valley. The system is operated by the Southeastern Pennsylvania Transportation Authority (SEPTA) and serves five counties in Pennsylvania—Bucks, Delaware, Montgomery, Chester, and Philadelphia—as well as Mercer County in New Jersey and New Castle County in Delaware. The system covers a total route length of 223 miles (359 km), 98 miles (158 km) of which are owned by SEPTA, with the remainder owned by Amtrak, CSX Transportation, and the City of Philadelphia. In the 2019 fiscal year, SEPTA Regional Rail had an annual ridership of 34.2 million, with an average weekday ridership of 118,800.