15th Street/City Hall station

15th Street/City Hall station is a rapid transit station complex in Philadelphia, Pennsylvania, located partially underneath Philadelphia City Hall. It is served by the B, L, and T lines of the SEPTA Metro system. The three lines have separate platforms connected through an underground concourse.

The Market Street Subway, used by the L and T, runs east-west under Market Street. The L uses the inner tracks, with two side platforms located between 15th Street and 16th Street. The five T services (T1, T2, T3, T4, and T5) use the outer tracks, which curve outward at 15th Street to loop around City Hall. The eastbound side platform for the T is located west of 15th Street; the westbound side platform is at the northwest corner of City Hall angled to the street grid. The four-track Broad Street Subway, which runs primarily north-south under Broad Street, angles west of Broad Street between Penn Square South and Arch Street. It passes under the Market Street Subway. The B has two island platforms between the tracks; the inner tracks are used by B2 express service, while the outer tracks are used by B1 local service. The B platforms are divided by thick walls that support the City Hall structure above. All six platforms at 15th Street/City Hall are connected by passageways within fare control. The concourse level has two north-south passages, outside of fare control, that flank 15th Street. They form part of the Center City Concourse, a system of underground passageways that connect transit stations in the Center City area. The concourse connects to Suburban Station and 13th Street station outside fare control; a now-closed passage formerly connected to Walnut–Locust station. The station has nine sets of faregates; most connect to the Center City Concourse. The station has seven full-time entrances – two on the east side of 16th Street, two on the west side of 15th Street, and three in Dilworth Park – plus two on the east side of City Hall that also serve 13th Street station. Three entrances are open limited hours: two in the City Hall courtyard (each with a separate stairs and escalator) and one in Centre Square. Two elevators connect the east concourse and street level on the east side of 15th Street on both ends of Dilworth Park; the northern elevator also serves the westbound T platform. Three elevators connect the east concourse to the L platforms and the eastbound T platform. Two additional elevators on the west side of 15th Street on Market Street connect street level, the west concourse, and the L platforms. There is no elevator access to the B platforms.

15th Street station was the original eastern terminus of the Market–Frankford subway–elevated, which was opened by the Philadelphia Transportation Company on August 3, 1907, and ran west to 69th Street in Upper Darby. In 1908, the Market–Frankford Line was extended eastward to Market-Chestnut (now closed). The original routing of the tracks curved around the foundations of the ornate City Hall building above, but was rebuilt into a straightened alignment in the mid-1930s in an effort to improve travel time. Construction of City Hall station on the Broad Street Line encountered difficulties in early 1916 when the City Hall foundation settled into excavation for the station underneath. The city considered abandoning the partially-complete station, building a curved subway around the west side of the building, and placing the station to the north. The station was ultimately finished at its original location, though the line did not open until September 1, 1928. An underground concourse – later the Center City Concourse – opened on October 13, 1936, providing a connection between the 15th Street and City Hall platforms.

Data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).