Other information points to some of the 54 series cars going originally to the Long Island in 1906/07 where they ran on 3rd Rail electric power. Yet other's went to the PRSL with trolley poles and 3rd rail shoes.
As for rebuilds, yes, they had many rebuilds. My favorite version is when the windows were replaced with the aluminum frames. They gave the cars a more modern look. Regardless, they served their owners well even if they were really uncomfortable to ride in. Septa retired the last sets in 1981. My uncle commuted from the Philly suburbs from 1965 to the mid 1990's and even as a railfan he still comments how much nicer it was when the Silverliners came online.
Time for a series in the PRRT&HS Keystone!
