Correct. That's why I didn't link it with cruise ships. It doesn't cruise. Basically, it's like the old fashioned transportation in the days before transatlantic air service. Mostly, it does straight port to/from port from one port in a country without intermediate stops in as short a reasonable time as it can. So, transatlantic US to UK is 7 days vs as much as twice that on cruise ships. You don't take Cunard for leisurely traveling and for on-board circuses.
So when Ferroequinologist corrected me by commenting that Cunard runs crossings, he is correct but I didn't consider them as a "cruise ship" because that's not how people think of cruise ships. In fact, we canceled a Cunard return of a European trip because, in our minds, it would have been no fun but just a bunch of old people showing how rich they are by dressing up at nightly formal dinners and going to elevator music concerts and boring lectures by unemployed college lecturers about the sites one actually sees when riding trains.
It actually would be a better counterpart to Amtrak than the cruise lines would be. Transportation with amenities rather than amenities with transport.