Sunday Skyline. On the afternoon of Sunday, December 18, 2022, SEPTA - iseptaphilly.com Train 719 (SPAX 844, Silverliner V) heading towards Trenton, New Jersey has a passing meeting with Amtrak Acela Train 2253 (AMTK 2036 trailing) in a 5 track segment of the Northeast Corridor Line. In the background through a maze of wires and poles is the Philadelphia, Pennsylvania skyline, which has in recent years become increasingly populated the the taller buildings.