As of 12:30 pm on Sunday, Septa has restored most of their services but their Regional Rail remains closed. Septa plans to have the Regional Rails operating on Monday morning, with some delays.
From ABC 6:
Regional Rail: Service on all SEPTA Regional Rail Lines will remain suspended today, with the exception of the Airport High Speed Line which will run hourly between Temple and the Airport. SEPTA and Amtrak are working around the clock to clear switches and tracks to make sure that the lines are safe and reliable for passengers and crews. Snow contractors are now working around the clock to clear stations. SEPTA anticipates that much of Regional Rail will be operating with delays on Monday morning.
For other information and updates – visit www.septa.org