then turning left and crossing the 40th Street tracks. When Filbert Street terminates at 41st Street, the tracks turn right, and head north until reaching Lancaster Avenue. Another set of diversionary trolley tracks begin near the 49th Street Regional Rail station, connecting Chester Avenue to Woodland Avenue (where Routes 11 and 36 separate) by way of 49th Street. History The subway–surface lines are remnants of the far more extensive streetcar system that developed in Philadelphia after the arrival of electric trolleys in 1892. Several dozen traction companies were consolidated in 1902 into the Philadelphia Rapid Transit Company. The PRT funneled the West Philadelphia lines into subway tunnels as they approached the city center. After the PRT declared bankruptcy in 1939, it was reopened as the Philadelphia Transportation Company (PTC), which was absorbed into SEPTA in 1968. In October 2006, University of Pennsylvania's class of 1956 funded the construction of an innovative portal for one of the eastbound entrances of the 37th Street station: a replica of a Peter Witt trolley of the kind manufactured by J. G. Brill and Company from 1923 to 1926. Operated by the Philadelphia Transportation Company, these trolleys brought university students to the campus and to Center City until 1956. Routes 11, 34 and 37 ran through the Penn campus on Woodland Avenue and Locust Streets for nearly 65 years. In 1956, the trolley route was buried to enable the university to unify its campus, with Woodland Avenue and Locust Street becoming pedestrian walkways. The subway–surface lines operated "Lifeline Service" due to the COVID-19 pandemic. As of April 2020, Route 34 was completely suspended, and the remaining routes are bypassing the , , , and stations in the Market Street tunnel. Service on Route 34 resumed on May 17, 2020. Service to the closed stations resumed in June 2020. In 2021, SEPTA proposed rebranding their rail transit service as "SEPTA Metro", in order to make the system easier to navigate. Under this proposal, the subway–surface lines will be rebranded as the "T" lines with a green color and numeric suffixes for each service. The 10, 34, 13, 11, and 36 would respectively become the T1 Lancaster Avenue, T2 Baltimore Avenue, T3 Chester Avenue, T4 Woodland Avenue, and T5 Elmwood Avenue. Routes All routes terminate at 15th Street station between 12:30 a.m. and 5:00 a.m. when 13th Street is closed. On Sunday evenings and during unexpected diversions,