The Market-Frankford Line is a rapid transit line in Philadelphia, Pennsylvania, operated by the Southeastern Pennsylvania Transportation Authority (SEPTA). It runs east-west, connecting the neighborhoods of Frankford in the northeast to West Philadelphia and the University City area. The line is known for its distinctive blue and silver trains and serves as a vital transportation link for commuters and residents. The line features 28 stations, with key stops including City Hall, 30th Street Station, and Frankford Terminal. It is one of the busiest transit lines in the region, providing access to various attractions, businesses, and educational institutions throughout the city.