Are there any bus companies that take bikes and go between Washington DC and Philadelphia? Some googling turns up a chinatown bus company ("focus transit"), but I called and they no longer go to Philly.  Anyone else taking bikes in the luggage bay as of summer 2015?
It turns out that Focus Transit actually goes between DC and Philly still.  The guy on the other end of the phone didn't know what he was talking about when I called.  They take bikes.