Pat Ness from Greencastle on 7/2/2019 1:07:18 PM:
Hello. We just finished the thru ride from Pittsburgh to DC this past friday....awesome. we did take the Amtrak back from DC to Pittsburgh on the Capitol limited. Our storage car had no racks at all... had to lay the bikes flat. No idea whether Amtrak can say what type of car you may have for your bikes, but this was just an open space, so a recumbent would have fit fine.
Additionally, you mention budget is a concern, but the Hampton, although a bit pricey, is about 2 blocks from the train station when you return, and takes 5 minutes or less to ride to upon returning. Also, if you stay there when you leave, your car can stay for free while you are gone. We were gone 8 days, and car was looked after and fine. Most, if not all other hotels in the immediate area charge for parking.
Just some more info for your planning