to the south of the Cira Centre and curves south as 30th Street under the SEPTA tracks again before turning west on John F. Kennedy Boulevard. Immediately east of 30th Street Station, PA 3 has an interchange with I-76 (Schuylkill Expressway) before it crosses over the Schuylkill River and then the Schuylkill River Trail and CSX's Philadelphia Subdivision railroad line on the river's east bank on the Market Street Bridge eastbound and the John F. Kennedy Boulevard Bridge westbound. At this point, PA 3 heads into Center City Philadelphia on four-lane undivided Market Street eastbound and four-lane divided John F. Kennedy Boulevard westbound. The streets pass several downtown skyscrapers, with the westbound direction running south of SEPTA's Main Line tracks, which head into the Center City Commuter Connection tunnel at 20th Street. At the 20th Street intersection, both directions of PA 3 become one-way streets, with Market Street carrying three lanes of eastbound traffic, with the fourth right-most lane serving as a bus lane, and John F. Kennedy Boulevard carrying four lanes of westbound traffic as it heads into the Penn Center business district. At the 19th Street intersection, the right-most lane on John F. Kennedy Boulevard becomes a bus lane. Eastbound PA 3 passes to the north of Liberty Place between 17th and 16th streets while westbound PA 3 passes to the south of the Comcast Center between 18th and 17th streets, Suburban Station of SEPTA Regional Rail between 17th and 16th streets, and LOVE Park between 16th and 15th streets. PA 3 reaches its eastern terminus at PA 611 (which runs north-south along Broad Street through Philadelphia) at 15th Street, which forms the western part of Penn Square around Philadelphia City Hall. History From 1793 to 1850, Philadelphia and West Chester were linked by a dirt road used by horse-drawn carriages and wagons. The Philadelphia and West Chester Turnpike Road Company was formed in March 1848 to build a turnpike between 38th and Market streets in Philadelphia and Newtown Square. The turnpike was to have five toll houses along its length. The West Chester Pike was constructed to improve farming and manufacturing in Delaware County. The turnpike became a plank road between 1850 and 1868. Rail service was first used on the turnpike in 1859, when the Delaware County Passenger Rail Road Company built a horse-drawn rail line from 38th and Market streets in Philadelphia to Howard House