Yes, I know its horribly stitched and color matched, but I found this map in the tiled catacombs of City Hall in 2007 and couldn’t resist taking pictures of every bit of it.
What’s most interesting here is where the lines went back then. This is after the Center City Connection, but before they instituted the numbering system, and before they built the connection to the airport. I haven’t gone down there since 2007 to see if this map is still there, but I hope someone saved it.
*click to embiggen