There was virtually zero enforcement in Berlin. On some lines half of passengers had no masks in the last week.
So yeah.
I think this is more about long distance trains and buses, local public transport not crossing state border was already following various local rules which were usually already relaxed.
funnily, I encountered an inspection in a tram where they did check for masks, and masks only. They wrote up personal details of the ones who did not have masks on them.
But this was the only time since the whole thing began and it was this year (when it was arguably already over).