[belorn]

> Everything is stable, and so quiet you can even sleep

That depend on the quality of the rail and train. I have had nice experience in Germany, but here in Sweden it is the opposite. The side-to-side movement triggers motion sickness that is only compare to really rough ocean trips, and while the noise is lower than on a plane it is also less regular and higher pitch so it can be quite hard to ignore.

The problems stems from rails and trains here being 30-50 years old and long history of poor maintenance. To make matters worse, almost no lines has redundant tracks so if there is a problem (which there often is because to the issue of maintenance), the train get replace with busses. Night trains in particular tend to have a rather terrible experience with trains that are by now around 50-70 years old. Because of the motion sickness, the handful times I tried it has resulted in me basically being sick for a full day afterward. This doesn't occur if I take a plane or drive.