William H. Gray III 30th Street Station, which was first opened in 1933, is the main railroad station in Philadelphia and is a major stop on Amtrak's Northeast and Keystone Corridors. This train station is one of the busiest intercity passenger railroad facilities in the United States. It is within walking distance of various attractions in West Philadelphia, notably the University of Pennsylvania, CHOP, Drexel University, and the University City Science Center, all in University City.