The Market–Frankford Line (MFL) is one of two rapid transit lines in Philadelphia, operated by SEPTA. It runs from the 69th Street Transportation Center in Upper Darby, just outside of West Philadelphia, through Center City Philadelphia to the Frankford Transportation Center in Near Northeast Philadelphia. With more than 180,000 boardings on an average weekday, it is the busiest route in the SEPTA system. The line has both elevated and underground portions along its full length. Until February 21, 2020, rush hour trains operated skip stop operation. The "M4" type trains that run on the MFL have passenger-accessible front windows, which provide an incredible view of the tracks ahead. Enjoy!
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Taken in October 2019.