Here is something else to think about. Last year I went on a Colorado tour with Adventure Cycling. Rode the Amtrak train for CA - CO. The checked baggage limit has been reduced to 50lbs per bag, just like the airlines. When I put my NWT + Front/Rear folding racks + trailer in the suitcase it was 56lbs. Had to move the trailer bits and racks to another suitcase to keep it under 50lbs.