Mid-Atlantic - Layover in PHL question

I’m flying from Toronto to Seattle, with a 8 hour layover in PHL. Is there any place I can leave my luggage while I see the city?

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I don't know the answer to your question, but have you considered just checking your luggage "through" from YYZ to SEA?

I’m flying from Toronto to Seattle, with a 8 hour layover in PHL. Is there any place I can leave my luggage while I see the city?
AFAIK, no. Check your bags through, if at all possible. If you're traveling on two different airlines and the first will not through-check to the second, you may be SOL. I doubt the second airline would allow you to check in 8 hours before your flight, although you could always try it.

Be aware also that baggage claim at PHL is notoriously slow. Your 8 hour connection might be more like 7 by the time you get your bag.

Agreed you should try to check your luggage through.
Here is the link to a very good guide to PHL from the US forum: http://www.flyertalk.com/forum/us-airways-dividend-miles/958317-us-guide-phl-philadelphia-airport.html

That guide confirms that there is no luggage storage at PHL unless you have access to the US club; you could leave your luggage there "at your own risk."

What about the lockers at the Amtrak Station?

What about the lockers at the Amtrak Station?AFAIK there are no lockers at 30th St. I've never seen any, and Amtrak's website says "no lockers."