15th Street station is a subway station in Philadelphia. It is served by SEPTA's Market–Frankford Line and all routes of the subway–surface trolley lines. A free interchange also provides access to the Broad Street Line at City Hall station, which is connected to 15th Street by the Downtown Link underground concourse. The concourse also connects to Regional Rail lines at Suburban Station. It is the busiest station on the Market–Frankford Line, with 29,905 boardings on an average weekday.

City Hall station is a SEPTA subway station in Philadelphia. Located in Center City underneath City Hall, it serves the Broad Street Line. It is the busiest station on the line, serving 57,000 passengers daily. City Hall station is served by local, express, and special "Sport Express" trains. Entrances are located on the east and west sides of City Hall, as well as in the central courtyard. A free interchange also provides access to the Market–Frankford Line at 15th Street station, which is connected to City Hall by the Downtown Link underground concourse.