The PATCO Speedline, also known colloquially as the PATCO High Speed Line, Lindenwold High Speed Line, or PATCO, is a rapid transit system operated by the Port Authority Transit Corporation, which runs between Philadelphia, Pennsylvania, and Camden County, New Jersey. The Speedline runs underground in Philadelphia, crosses the Delaware River on the Benjamin Franklin Bridge, runs underground in Camden, then runs above ground in New Jersey until the east end of the line. The Port Authority Transit Corporation and the Speedline are owned and operated by the Delaware River Port Authority. Speedline operation began on February 15, 1969, with the first trip from Lindenwold, New Jersey, to Center City, Philadelphia. The line transports over 38,000 people daily and operates 24 hours a day, one of only six U.S. rapid transit systems (the others being the New York City Subway, Staten Island Railway, the Red and Blue Lines of the Chicago 'L', the PATH lines, and certain lines of the Minneapolis-St. Paul METRO) to do so. In 2012, the system carried 10,612,897 passengers, the highest number for any of the previous ten years.