Originally Posted by prathmann

Good to have a bag to cover the bike both for its protection and to protect other things it may contact. But note that Amtrak's normal carry-on luggage size limit is much more restrictive: 28 x 22 x 14 inches - so a fussy conductor could still object to a folding bike inside a bag just on the basis of its size. As mentioned above, it would be good to carry a copy of the official Amtrak policy on folding bikes just in case anyone raises concerns about the size.