I would say that for long distance trains only English and the local language should be enough.
For international trains, we should have all languages of all traversed countries and English. So for example a train from Paris to Frankfurt should have announcements in French, German and English (and it is actually the case for that train, I already rode it).
But for example, the Berlin - Warsaw train has only English announcements besides the local language depending on the country the train is in (so no Polish when it is in Germany, and no German when it is in Poland), I consider this to be wrong. It should have announcements in Polish, German and English for the whole route.
It is mostly an issue in countries with 120V mains (I know that in the US 240V outlets exist though).
In France for example it is required that standard plugs must be able to deliver at least 16A on each outlet, at the 230V used here, we get 3600W of power, that’s more than enough.
The ability to read a lower rez version of the images is a feature that is actively used. That way you don’t need to have both a 2K and 4K DCP for movies that have a 4K version, 2K projectors can simply decode the 4K DCP at 2K resolution.
For international trains, we should have all languages of all traversed countries and English. So for example a train from Paris to Frankfurt should have announcements in French, German and English (and it is actually the case for that train, I already rode it).
But for example, the Berlin - Warsaw train has only English announcements besides the local language depending on the country the train is in (so no Polish when it is in Germany, and no German when it is in Poland), I consider this to be wrong. It should have announcements in Polish, German and English for the whole route.