Philadelphia 30th Street Station had third most passengers in 2007; New York Penn Station first; Union Station Washington DC second

In a story in the Philadelphia Inquirer about Kummant's resignation is a one liner about passenger traffic:

"In 2007, Philadelphia's 30th Street Station was the third-busiest Amtrak station, behind New York and Washington."

This is probably common knowledge and likely will be the same for 2008.