International/high speed trains are the closest European comparison to Amtrak. The distances their trains span are enormous. But yeah, a lot of European rail a

International/high speed trains are the closest European comparison to Amtrak. The distances their trains span are enormous. But yeah, a lot of European rail also still has a fixed-price fare you can buy on the day of departure – although that fare is usually much higher than the (dynamically priced) saver fare, if available. So functionally, it's just a cap of the maximum dynamic rate, at this point.