You don't need a license to travel Amtrak. In many cases you don't even need a ticket when boarding the train. I routinely buy mine after it has left the station.
Hell no, I love the low friction travel. But I haven't been asked for an ID on Amtrak since the mid 2000s when they still served booze on that line. On the line I use most frequently they never ask for an ID. And a ticket for tomorrow works for today. Almost nothing nothing in that faq is adhered to on my experience.