The SEPTA subway–surface trolley lines are a collection of five SEPTA trolley lines that operate on street-level tracks in West Philadelphia and Delaware County, Pennsylvania, and also underneath Market Street in Philadelphia's Center City. The lines, Routes 10, 11, 13, 34, and 36, collectively operate on about of route. SEPTA's Route 15, the Girard Avenue Line, is another streetcar line that is designated green on route maps but is not part of the subway–surface system. Like Boston's Green Line and San Francisco's Muni Metro, the SEPTA trolley line is the descendant of a pre-World War II streetcar system. It also shares many similarities with the premetro and stadtbahn systems of continental Europe. Where Boston and San Francisco's systems use longer, articulated LRT vehicles, Philadelphia uses rigid vehicles roughly longer than the PCC streetcar they replaced. The lines use Kawasaki Type K LRVs delivered in 1981–82. The cars are similar to those on Routes 101 and 102 100 series, SEPTA's suburban trolley routes, which were delivered around the same time. However, the subway–surface cars are single-ended and use trolley poles, while the suburban lines use double ended cars and pantographs for power collection. Route description Center City The subway opened for passenger service December 15, 1906. Starting from their eastern terminus at 13th Street station near City Hall, the trolleys loop around in a tunnel under City Hall before stopping under Dilworth Park at 15th Street station and then realign back under Market Street. All five routes also stop at 19th Street, 22nd Street, 30th Street, and 33rd Street, which are all underground stations. From 15th to 30th Streets, they run in the same tunnel as SEPTA's Market–Frankford Line, which runs express on the inner tracks while the trolleys utilize the outer ones. Passengers may transfer free of charge to the Market–Frankford Line at 13th, 15th, and 30th Streets, as well as to the Broad Street Line at 15th Street. Connections to the Regional Rail are also available via underground passageways connecting 13th and 15th Street stations to Suburban Station, one of the city's main commuter rail terminals. University City After traveling under the Schuylkill River, the trolley lines provide access to 30th Street Station, the Philadelphia area's main intercity rail and commuter rail station, located across the street from the trolley and rapid transit station. Connections are available to SEPTA Regional Rail, many Amtrak services, and New Jersey Transit's Atlantic