Filed under: SEPTA 24/7 By April Gardner Mar 25, 2015, 4:35pm EDT SEPTA is heading towards planning a rail extension to King of Prussia. What we know thus far: it will be off the Norristown High-Speed Rail Line, and the the five-mile route will be on an elevated concrete track. The stop will come to the King of Prussia Mall, end at the Valley Forge Casino and Convention Center, and have up to four stops along the way. The line should be up and running by 2023, but the shape of the route and other decisions are still up in the air. There are public workshops today at 4 and 6:30pm at the DoubleTree Hotel in King of Prussia. [Philly Mag]