I know the owner of a limo service in NYC - I can contact him and ask if he can recommend anyone in Philadelphia. I met him on the Wind Surf in the Med a few years ago. Let me know if you want me to call him or I can give you his number.
If you're train junkies you'll appreciate this - I did the Venice-Simplon Orient Express from Paris to Venice. It was a dream come true! I kept waiting to run into Poirot around every corner!