And my experience is only with Flanders which is basically one large city, I can only imagine how it is in the less populated areas of Wallonia or Limburg.
But I absolutely think that nuclear is a good option for such a small and dense country. Taking over the plants as they are nearly decommissioned is a stupid move though, but you can't expect anything sensible from this government.
I do take the train quite often as I said, anything on large axes is usually fine (Brussels - Charleroi, Brussels - Antwerp, etc) but yeah smaller lines are usually struggling some more.
I wish we had more ambitious governments in general, not only in terms of energy but also in the (bio)tech scene, which used to be touted as our great strength (we do have a lot of pharma companies though).
Running ancient nuclear power plants in one of the most densely populated countries does not seem wise.
These plants have been running with phase-out in mind for the last 20 years.