City Line. An underground passageway that connects these two stations was closed in the 1980s due to safety concerns. In 2016, the 30th Street Station District proposed overhauling both 30th Street Station's SEPTA and trolley stations including, by public demand, the reopening the tunnel that connects the two (currently separate) stations. Presently, passengers connecting to and from the subway-surface lines and Market-Franford Line must walk outside to cross the busy 30th Street, and then enter the other station. The timeline called for the tunnel overhaul to be part of Phase 1 and thus completed by 2020. All routes then stop at 33rd Street, near Drexel University. After this stop, Route 10 diverts from the others and emerges from the tunnel at the 36th Street Portal just south of Market Street, then turns north onto 36th Street and then northwest along Lancaster Avenue and other surface streets. The other four lines make underground stops at 36th and Sansom streets and 37th and Spruce streets on the campus of the University of Pennsylvania before surfacing at the 40th Street Portal near Baltimore Avenue, heading southwest on surface streets. Points south and west The Route 11 line travels along Woodland Avenue in Philadelphia and Main Street in Darby. It crosses a CSX Transportation railroad line at grade, one of very few at-grade crossing between a trolley line and a major freight rail line in the United States. (Another belongs to the TECO streetcar system in Tampa, Florida.) A crash on December 9, 2021, between car 9070 and a CSX freight train resulted in injuries to 7 passengers. Diversion services All five trolleys can be diverted onto auxiliary surface tracks west of the 40th Street Portal when tunnels are closed due to maintenance, an accident, or some other obstruction. Tracks for Route 10 start at Lancaster Avenue (Route 10) and proceed southbound along 40th Street. At Market Street, the line connects to the Market–Frankford Line at its 40th Street station. The surface tracks continue southbound to Spruce Street, where they split either eastbound or westbound. Westbound tracks run to 42nd Street where they turn south to either Baltimore Avenue (Route 34), Chester Avenue (Route 13), or Woodland Avenue (Routes 11 and 36). Tracks for the other four routes run northbound along 42nd Street, then turning east onto Spruce Street and then north onto 38th Street (US 13). From here, it travels to Filbert Street,