It'll be a long time before SEPTA has all high-level platforms. Would there be structural issues in cutting the side sills to provide low-level boarding?
NPL: As you probably know Metra replaced the entire 70s era Highliner fleet in recent years. The Highliner
cars are of the "gallery" configuration (limited upper level seats) and ran on 1500 VDC power.
Multilevel-type cars with full upper and lower levels would be a better additional fit either as more push-pull
cars or a new EMU essentially representing a Silverliner Six order for SEPTA RRD...MACTRAXX