Ah sorry, I misread. It looks like there is 24-hour subway service, but only on weekends, with bus replacements on Sun-Thu: http://www.septa.org/service/all-nig

Ah sorry, I misread. It looks like there is 24-hour subway service, but only on weekends, with bus replacements on Sun-Thu: http://www.septa.org/service/all-night.html http://www.septa.org/service/all-night.html