30th Street station is an underground SEPTA rapid transit and trolley station in Philadelphia. It serves the Market–Frankford Line and SEPTA Subway–Surface Trolley Lines. It is located on Market Street between 30th and 31st Streets in the University City neighborhood near the main 30th Street Station and Drexel University. The station features four tracks—two outer tracks for the Subway-Surface trolleys, and two inner tracks for the Market-Frankford subway trains. A free transfer is available between both services via a mezzanine level which provides access to all four tracks.The underground station was originally built in 1956 as a replacement for the 32nd Street elevated station which opened in 1907. It is located ½ block southwest of the 30th Street Railway Station, which is served by Amtrak, SEPTA Regional Rail, and New Jersey Transit trains. An underground tunnel connects the two stations, but has been closed due to crime concerns, and the only connection is above ground. The station was recently renovated, and has since become one of four accessible underground stations on the Market-Frankford Line in Center City. Accessibility features include an elevator in addition to a staircase.