Nice shots, Robert - I'm always nervous taking pictures inside 30th Street Station for fear of being hassled despite the obvious fact that it's a national landmark. There are almost always a few police within site and they have their own booth near where you took the shot.
What camera /lens did you use - looks nice. I returned with a 7D and a 10mm and this was my best shot yet - very high ISO and lot's of Photoshop perspective correction.
30th Street Station interior
One day I'll return to get the still mechanical train board.
Here's a few from the station, including the parking garage mentioned. I didn't shoot the high line due to the sporadic nature of freight on that line but you can get a great shot of the city in the late afternoon.
Amtrak Acela from parking garage
SEPTA train from the upper platform
/Mitch