I assume you are talking about taking the folder on the train as carry on luggage within their folding bike criteria. You did not mention that, but since a number of Amtrak stations do not handle checked luggage (a full size bike is checked luggage), a folder can offer more flexibility on where to get on and off.
Originally Posted by
wernst
always have amtrak's rules for folding bikes printed out and with you at all times. You can oftentimes get a conductor who doesn't know the folding bike rules. Wave it in their faces and climb aboard. ....
Fully agree, I have had an Amtrak station manger tell me I was out of compliance with their rules, I told him their rules on the website are quite different and that I was in compliance with their published rules. He paused, then said that he keeps telling them to change the website.