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. 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.