Originally Posted by
monster
I don't know about Philadelphia, but the bus stop in New York's Chinatown (under the Manhattan Bridge just off East Broadway) is NOT particularly close to any subways.
There are also Chinatown buses that stop at Penn Station--the OP will just have to do a little research into which ones. In Philadelphia, I think most of the buses run from near Reading Market and the Convention Center (sorry if I've got the names wrong).