Powell Street station (often Powell station) is a combined BART and Muni Metro rapid transit station in the Market Street subway. Located under Market Street between 4th Street and 5th Street, it serves the Financial District neighborhood and surrounding areas. The three-level station has a large fare mezzanine level, with separate platform levels for Muni Metro and BART below. The fare mezzanine also connects to the Union Square/Market Street station. The Powell-Mason and Powell-Hyde cable car lines turn around at Powell and Market adjacent to the station and Hallidie Plaza. BART service at the station began on November 5, 1973, followed by Muni Metro service on February 18, 1980. From Wikipedia