I frequently travel with a Dahon MU P8. I agree that it wouldn't fit very well in VL room if there are two people (I've never traveled alone in one). What I did once was sneak the bike onto a coach where there was ample luggage space. I did this successfully departing CHI on the LSL and returning from Albany after biking the Erie Canal from Buffalo to Albany. Several times when traveling to Florida, I packed it in an airline legal suitcase; and the station agents were kind enough to store the suitcase until I returned. But I wouldn't count on that. Another time we manage to carry the suitcases to our motel. A 20" Dahon would get lost in an Amtrak box; and I doubt you would have to remove the pedals. Since your origin and destination has walk up bike service, I would go that route. I don't see why you would have to fold it (nothing in the rules indicating that a clown bike is not acceptable). I doubt Amtrak will have thought through the question of whether walk up bike service for a folder works better folded or not.