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Open Thread: What would your ideal Philly subway system look like
13th Street station (SEPTA) - Alchetron, the free social encyclopedia
nycsubway.org: SEPTA Subway-Surface Streetcar Lines
Philadelphia: Subway-Surface Lines
Philadelphia City Hall Subway Concourse, 1929 – Transit Maps Store
13th Street station map - Philadelphia subway
Philadelphia Railfan Guide - Stations
SEPTA's Surface Subway Lines - Philadelphia PA